Big & Tall Dobby Flat Front Stretch Chino (Dark Denim)
Big & Tall Dobby Flat Front Stretch Chino (Dark Denim)
Big & Tall Dobby Flat Front Stretch Chino (Dark Denim)
Big & Tall Dobby Flat Front Stretch Chino (Dark Denim)

Big & Tall Anywhere Stretch Chino Pant

Select color Copen Blue
Select color Dark Denim
Select color Black

Regular price $89.50 Sale price $35.97 60%

Variant Selection
Variant Selection
Variant Selection

Final Sale: No Returns or Exchanges

Only 37 in stock

Free U.S. Shipping on $75+ Orders


Text a Stylist
Delivery to enter zip code

No Store Selected

TOPS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE XS S M L XL XXL
NECK 14 ⅞" - 15 ¼" 15 ½ -15 ⅞" 16 ⅛ -16 ½" 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝"
CHEST 35" - 36" 37" - 38" 39" - 40" 42" - 44" 46" - 48" 50" - 52"
WAIST 29 ½" - 30 ½" 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
ARM LENGTH (NECK TO WRIST) 32 ¼" - 32 ⅜" 32 ½" - 32 ¾" 32 ⅞" - 33" 33 ⅜" - 33 ⅝" 33 ⅞" - 34 ⅜" 34 ½" - 35"


BIG SIZES

SIZE 2X 3X 4X
NECK 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 21 ⅛" - 21 ⅝"
CHEST 50" - 52" 54" - 56" 58" - 60"
WAIST 45 ¾" - 48" 50 ¼" - 52 ½" 54 ¾" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅝" - 35" 35 ⅜" - 35 ¾" 36" - 36 ⅜"


TALL SIZES

SIZE LT XLT 2XLT 3XLT 4XLT
NECK 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 20 ⅝" - 21 ⅝"
CHEST 42" - 44" 46" - 48" 50" - 52" 54" - 56" 58" - 60"
WAIST 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48" 50 ½" - 52 ½" 54" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅜" - 34 ⅝" 34 ⅞" - 35 ⅜" 35 ½" - 36" 36 ¼" - 36 ¾" 36 ⅞" - 37 ⅜"


BOTTOMS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

Alpha Size
SIZE S M L XL XXL
WAIST 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
LOW HIP
(SEAT)
36 ½" - 37 ½" 38 ½" - 39 ½" 41 ½" - 43 ¼" 45" - 46 ¾" 48 ½" - 50 ½"


Numerical Size
SIZE 29 30 31 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 31 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP
(SEAT)
34 ½" 35 ½" 36 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP
(SEAT)
48 ½" 50 ½" 52 ½"


SUITING

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


SUIT JACKETS - REGULAR SIZES

SIZE 36 38 40 42 44 46
NECK 15 ¼" 15 ⅞" 16 ½" 17 ⅛" 17 ⅝" 18 ⅛"
CHEST 36" 38" 40" 42" 44" 46"
WAIST 30 ½" 32 ½" 34 ½" 36 ¾" 39" 41 ¼"
ARM LENGTH
(NECK TO WRIST)
32 ⅜" 32 ¾" 33" 33 ⅜" 33 ⅝" 33 ⅞"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - REGULAR SIZES

SIZE 29 30 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP (SEAT) 34 ½" 35 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


SUIT JACKETS - BIG SIZES

SIZE 48 50 52
NECK 18 ⅝" 19 ⅛" 19 ⅝"
CHEST 48" 50" 52"
WAIST 43 ½" 45 ¾" 48"
ARM LENGTH (NECK TO WRIST) 34 ¼" 34 ⅝" 35"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP (SEAT) 48 ½" 50 ½" 52 ½"


UNDERWEAR

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE S M L XL
WAIST (IN) 28" - 30" 32" - 34" 36" - 38" 40" - 42"
WAIST (CM) 71" - 76" 81" - 86" 91" - 97" 102" - 107"


BELTS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE 30 32 34 36 38 40
S S S M L XL
WAIST (IN) 28" 30" 32" 34" 36" 38"


SHOES

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE
US 7 ½" 8" 8 ½" 9" 9 ½" 10" 10 ½" 11" 11 ½" 12" 13"
EURO 40" 40 ½" 41 ½" 42" 42 ½" 43" 44" 44 ½" 45" 45 ½" 47"


MEASURING GUIDE

Use the instructions below to measure yourself and find the size that works best. Use a fabric tape measure, wear minimal clothing, and have another person assist you.

MEN'S SIZE CHART - Body Guide

Stretch

  • Description

      Revamp your wardrobe with these comfortable chinos for men from Perry Ellis. The men’s pants have a flat front design for a sleek, modern look. Dobby fabrication weaves raised geometric shapes into the material, for a sophisticated surface texture. Added stretch keeps them easy to move in, while a zip fly and front and back pockets complete the versatile design.

    • 98% Cotton / 2% Elastane
    • Big & Tall Fit
    • Dobby Fabrication Is Characterized By Miniature Geometric Patterns Woven Into Fabric
    • Big & Tall Extends Sizing Past XL
    • Slim Fit For A Modern Silhouette
    • Added Stretch For A Comfortable Fit
    • Flat Front Design For A Sleek Look
    • Open Front Pockets
    • Buttoned Back Pockets
    • Machine Wash
    • Imported

    • 4FSB9662RT - 795570532289

Stretch

We offer the following convenient delivery options within the United States.

Perry Perks members get access to exclusive free shipping offers. The program is free to join and also rewards you with points for every purchase.

Easy Returns:
We will issue a refund, excluding any shipping and handling fees, for all unused, undamaged and/or defective products returned within 30 days of purchase. All products must be returned in its original packaging and with all accessories to ensure a full credit.

Big & Tall Dobby Flat Front Stretch Chino (Black)
Big & Tall Dobby Flat Front Stretch Chino (Black)
Big & Tall Dobby Flat Front Stretch Chino (Black)
Big & Tall Dobby Flat Front Stretch Chino (Black)

Big & Tall Anywhere Stretch Chino Pant

Select color Copen Blue
Select color Dark Denim
Select color Black

Regular price $89.50 Sale price $35.97 60%

Variant Selection
Variant Selection
Variant Selection

Final Sale: No Returns or Exchanges

Only 18 in stock

Free U.S. Shipping on $75+ Orders


Text a Stylist
Delivery to enter zip code

No Store Selected

TOPS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE XS S M L XL XXL
NECK 14 ⅞" - 15 ¼" 15 ½ -15 ⅞" 16 ⅛ -16 ½" 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝"
CHEST 35" - 36" 37" - 38" 39" - 40" 42" - 44" 46" - 48" 50" - 52"
WAIST 29 ½" - 30 ½" 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
ARM LENGTH (NECK TO WRIST) 32 ¼" - 32 ⅜" 32 ½" - 32 ¾" 32 ⅞" - 33" 33 ⅜" - 33 ⅝" 33 ⅞" - 34 ⅜" 34 ½" - 35"


BIG SIZES

SIZE 2X 3X 4X
NECK 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 21 ⅛" - 21 ⅝"
CHEST 50" - 52" 54" - 56" 58" - 60"
WAIST 45 ¾" - 48" 50 ¼" - 52 ½" 54 ¾" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅝" - 35" 35 ⅜" - 35 ¾" 36" - 36 ⅜"


TALL SIZES

SIZE LT XLT 2XLT 3XLT 4XLT
NECK 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 20 ⅝" - 21 ⅝"
CHEST 42" - 44" 46" - 48" 50" - 52" 54" - 56" 58" - 60"
WAIST 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48" 50 ½" - 52 ½" 54" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅜" - 34 ⅝" 34 ⅞" - 35 ⅜" 35 ½" - 36" 36 ¼" - 36 ¾" 36 ⅞" - 37 ⅜"


BOTTOMS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

Alpha Size
SIZE S M L XL XXL
WAIST 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
LOW HIP
(SEAT)
36 ½" - 37 ½" 38 ½" - 39 ½" 41 ½" - 43 ¼" 45" - 46 ¾" 48 ½" - 50 ½"


Numerical Size
SIZE 29 30 31 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 31 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP
(SEAT)
34 ½" 35 ½" 36 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP
(SEAT)
48 ½" 50 ½" 52 ½"


SUITING

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


SUIT JACKETS - REGULAR SIZES

SIZE 36 38 40 42 44 46
NECK 15 ¼" 15 ⅞" 16 ½" 17 ⅛" 17 ⅝" 18 ⅛"
CHEST 36" 38" 40" 42" 44" 46"
WAIST 30 ½" 32 ½" 34 ½" 36 ¾" 39" 41 ¼"
ARM LENGTH
(NECK TO WRIST)
32 ⅜" 32 ¾" 33" 33 ⅜" 33 ⅝" 33 ⅞"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - REGULAR SIZES

SIZE 29 30 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP (SEAT) 34 ½" 35 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


SUIT JACKETS - BIG SIZES

SIZE 48 50 52
NECK 18 ⅝" 19 ⅛" 19 ⅝"
CHEST 48" 50" 52"
WAIST 43 ½" 45 ¾" 48"
ARM LENGTH (NECK TO WRIST) 34 ¼" 34 ⅝" 35"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP (SEAT) 48 ½" 50 ½" 52 ½"


UNDERWEAR

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE S M L XL
WAIST (IN) 28" - 30" 32" - 34" 36" - 38" 40" - 42"
WAIST (CM) 71" - 76" 81" - 86" 91" - 97" 102" - 107"


BELTS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE 30 32 34 36 38 40
S S S M L XL
WAIST (IN) 28" 30" 32" 34" 36" 38"


SHOES

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE
US 7 ½" 8" 8 ½" 9" 9 ½" 10" 10 ½" 11" 11 ½" 12" 13"
EURO 40" 40 ½" 41 ½" 42" 42 ½" 43" 44" 44 ½" 45" 45 ½" 47"


MEASURING GUIDE

Use the instructions below to measure yourself and find the size that works best. Use a fabric tape measure, wear minimal clothing, and have another person assist you.

MEN'S SIZE CHART - Body Guide

Stretch

  • Description

      Revamp your wardrobe with these comfortable chinos for men from Perry Ellis. The men’s pants have a flat front design for a sleek, modern look. Dobby fabrication weaves raised geometric shapes into the material, for a sophisticated surface texture. Added stretch keeps them easy to move in, while a zip fly and front and back pockets complete the versatile design.

    • 98% Cotton / 2% Elastane
    • Big & Tall Fit
    • Dobby Fabrication Is Characterized By Miniature Geometric Patterns Woven Into Fabric
    • Dobby Fabrication Adds Subtle Texture
    • Big & Tall Extends Sizing Past XL
    • Added Stretch For A Comfortable Fit
    • Flat Front Design For A Sleek Look
    • Open Front Pockets
    • Buttoned Back Pockets
    • Machine Wash
    • Imported

    • 4FSB9662RT - 795570532210

Stretch

We offer the following convenient delivery options within the United States.

Perry Perks members get access to exclusive free shipping offers. The program is free to join and also rewards you with points for every purchase.

Easy Returns:
We will issue a refund, excluding any shipping and handling fees, for all unused, undamaged and/or defective products returned within 30 days of purchase. All products must be returned in its original packaging and with all accessories to ensure a full credit.

Big & Tall Dobby Flat Front Stretch Chino (Copen Blue)
Big & Tall Dobby Flat Front Stretch Chino (Copen Blue)
Big & Tall Dobby Flat Front Stretch Chino (Copen Blue)
Big & Tall Dobby Flat Front Stretch Chino (Copen Blue)

Big & Tall Anywhere Stretch Chino Pant

Select color Copen Blue
Select color Dark Denim
Select color Black

Regular price $89.50 Sale price $35.97 60%

Variant Selection
Variant Selection
Variant Selection

Final Sale: No Returns or Exchanges

Only 16 in stock

Free U.S. Shipping on $75+ Orders


Text a Stylist
Delivery to enter zip code

No Store Selected

TOPS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE XS S M L XL XXL
NECK 14 ⅞" - 15 ¼" 15 ½ -15 ⅞" 16 ⅛ -16 ½" 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝"
CHEST 35" - 36" 37" - 38" 39" - 40" 42" - 44" 46" - 48" 50" - 52"
WAIST 29 ½" - 30 ½" 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
ARM LENGTH (NECK TO WRIST) 32 ¼" - 32 ⅜" 32 ½" - 32 ¾" 32 ⅞" - 33" 33 ⅜" - 33 ⅝" 33 ⅞" - 34 ⅜" 34 ½" - 35"


BIG SIZES

SIZE 2X 3X 4X
NECK 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 21 ⅛" - 21 ⅝"
CHEST 50" - 52" 54" - 56" 58" - 60"
WAIST 45 ¾" - 48" 50 ¼" - 52 ½" 54 ¾" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅝" - 35" 35 ⅜" - 35 ¾" 36" - 36 ⅜"


TALL SIZES

SIZE LT XLT 2XLT 3XLT 4XLT
NECK 17 ⅛" - 17 ⅝" 18 ⅛" - 18 ⅝" 19 ⅛" - 19 ⅝" 20 ⅛" - 20 ⅝" 20 ⅝" - 21 ⅝"
CHEST 42" - 44" 46" - 48" 50" - 52" 54" - 56" 58" - 60"
WAIST 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48" 50 ½" - 52 ½" 54" - 57"
ARM LENGTH
(NECK TO WRIST)
34 ⅜" - 34 ⅝" 34 ⅞" - 35 ⅜" 35 ½" - 36" 36 ¼" - 36 ¾" 36 ⅞" - 37 ⅜"


BOTTOMS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

Alpha Size
SIZE S M L XL XXL
WAIST 31 ½" - 32 ½" 33 ½" - 34 ½" 36 ¾" - 39" 41 ¼" - 43 ½" 45 ¾" - 48"
LOW HIP
(SEAT)
36 ½" - 37 ½" 38 ½" - 39 ½" 41 ½" - 43 ¼" 45" - 46 ¾" 48 ½" - 50 ½"


Numerical Size
SIZE 29 30 31 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 31 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP
(SEAT)
34 ½" 35 ½" 36 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP
(SEAT)
48 ½" 50 ½" 52 ½"


SUITING

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


SUIT JACKETS - REGULAR SIZES

SIZE 36 38 40 42 44 46
NECK 15 ¼" 15 ⅞" 16 ½" 17 ⅛" 17 ⅝" 18 ⅛"
CHEST 36" 38" 40" 42" 44" 46"
WAIST 30 ½" 32 ½" 34 ½" 36 ¾" 39" 41 ¼"
ARM LENGTH
(NECK TO WRIST)
32 ⅜" 32 ¾" 33" 33 ⅜" 33 ⅝" 33 ⅞"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - REGULAR SIZES

SIZE 29 30 32 33 34 36 38 40 42
WAIST 29 ½" 30 ½" 32 ½" 33 ½" 34 ½" 36 ¾" 39" 41 ¼" 43 ½"
LOW HIP (SEAT) 34 ½" 35 ½" 37 ½" 38 ½" 39 ½" 41 ½" 43 ¼" 45" 46 ¾"


SUIT JACKETS - BIG SIZES

SIZE 48 50 52
NECK 18 ⅝" 19 ⅛" 19 ⅝"
CHEST 48" 50" 52"
WAIST 43 ½" 45 ¾" 48"
ARM LENGTH (NECK TO WRIST) 34 ¼" 34 ⅝" 35"


Compared to regular suit jackets, short suit jackets are 1 ¼” shorter in body length and 1 ¼” shorter in arm length. Long suit jackets are 1 ¼” longer in body length and 1 ¼” longer in arm length.



SUIT PANTS - BIG SIZES

SIZE 44 46 48
WAIST 45 ¾" 48" 50 ¼"
LOW HIP (SEAT) 48 ½" 50 ½" 52 ½"


UNDERWEAR

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE S M L XL
WAIST (IN) 28" - 30" 32" - 34" 36" - 38" 40" - 42"
WAIST (CM) 71" - 76" 81" - 86" 91" - 97" 102" - 107"


BELTS

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE 30 32 34 36 38 40
S S S M L XL
WAIST (IN) 28" 30" 32" 34" 36" 38"


SHOES

The charts below reflect body measurements. Please use this chart as a general guide to choose the best size for you.


REGULAR SIZES

SIZE
US 7 ½" 8" 8 ½" 9" 9 ½" 10" 10 ½" 11" 11 ½" 12" 13"
EURO 40" 40 ½" 41 ½" 42" 42 ½" 43" 44" 44 ½" 45" 45 ½" 47"


MEASURING GUIDE

Use the instructions below to measure yourself and find the size that works best. Use a fabric tape measure, wear minimal clothing, and have another person assist you.

MEN'S SIZE CHART - Body Guide

Stretch

  • Description

      Revamp your wardrobe with these comfortable chinos for men from Perry Ellis. The men’s pants have a flat front design for a sleek, modern look. Dobby fabrication weaves raised geometric shapes into the material, for a sophisticated surface texture. Added stretch keeps them easy to move in, while a zip fly and front and back pockets complete the versatile design.

    • 98% Cotton / 2% Elastane
    • Big & Tall Fit
    • Dobby Fabrication Is Characterized By Miniature Geometric Patterns Woven Into Fabric
    • Slim Fit For A Modern Silhouette
    • Added Stretch For A Comfortable Fit
    • Flat Front Design For A Sleek Look
    • Open Front Pockets
    • Buttoned Back Pockets
    • Machine Wash
    • Imported

    • 4FSB9662RT - 795570625004

Stretch

We offer the following convenient delivery options within the United States.

Perry Perks members get access to exclusive free shipping offers. The program is free to join and also rewards you with points for every purchase.

Easy Returns:
We will issue a refund, excluding any shipping and handling fees, for all unused, undamaged and/or defective products returned within 30 days of purchase. All products must be returned in its original packaging and with all accessories to ensure a full credit.


By submitting your review you agree to the perryellis.com terms & conditions.