REI Children's Sizes Infant Toddler
  3 mo 6 mo 9 mo 12 mo 18 mo 24 mo/2T 3T 4T
Height 24 27 29 30.5 33 35 38 41
Weight 10 - 14.5 15 - 18 18.5 - 22 22.5 - 25 25.5 - 28 28.5 - 30 n/a n/a

REI Kids Sizes XXS XXS XS XS S M M L L XL
Boys/Girls 4 5 6 7 8 10 12 14 16 18
Girls Height 41 44 46.5 50.5 52.5 55 58 61 62.5 62.5
Girls Chest 22 23 24 26 27 28.5 30 31.5 33.5 35.5
Girls' Waist 22 22.5 23 23.5 24.5 25 26 28 30 32
Girls Hip 23 24 25 27.5 28.5 30 32 34 36 38
Boys Height 41 44 46.5 49.5 52 55.5 58.5 62.5 65 67
Boys Chest 22 23 24 25.5 26.5 27.5 28.5 30.5 32 33.5
Boys Waist 22 22.5 23 23.5 24.5 25.5 26.5 28 29.5 31
Boys Hip 21 23 25 26.5 27 28 29 30.5 32 33.5

REI Child Hat Sizes 0-6 months 6-12 months 1-3 years 4-7 years 7-14 years
Head Circumference (in.) 16 17 18 19 20

REI Child Gloves and Mitts 12 - 18 months 2T (1 - 2 years) 3T (2 - 3 years) 4/5T (4 - 5 years) XS (6 - 7 years) S (8 years) M (10 - 12 years) L (14 - 16 years) XL (18 years)
Knuckle Circumference (in.) less than 4 4.5 5 5.5 6 6.5 7 7.5 8
Hand Length (in.) less than 3.5 4 4.5 5 5.5 6 6.5 7 7.5

REI Child Sock Approximate Age
  2-5 years 4-7 years 6-10 years 10-12 years
Shoe Sizes 6-8.5 9-11.5 12-2.5 3-6
Sock Sizes XS S M L

Measurements stated in inches unless otherwise indicated.