| REI Men's Sizes | S | M | L | XL | XXL | XXXL |
| Neck | 14.5 - 15 | 15.5 - 16 | 16.5 - 17 | 17.5 - 18 | 18.5 - 19 | 19.5 - 20.5 |
| Chest | 35 - 38 | 38 - 41 | 42 - 45 | 46 - 49 | 50 - 53 | 54 - 57 |
| Waist | 28 - 30 | 32 - 34 | 36 - 38 | 40 - 42 | 44 - 46 | 48 - 50 |
| Hip/Seat | 35 - 37 | 38 - 40 | 41 - 43 | 44 - 46 | 47 - 49 | 51 - 54 |
| Sleeve | 33 | 34 | 35 | 35.5 | 36 | 36.5 |
| Inseam | 32 | 32 | 32 | 32 | 32 | 32 |
Short sizes are available in some pants, which generally means 2.5 in. shorter in inseam length. Tall sizes are available in some pants, shirts and jackets, which generally means 2 in. longer in the body of the shirt or jacket, 2.5 in. longer in parka, 1.5 in. longer in sleeve length, 3 in. longer in inseam length and 1 in. longer in total rise compared to regular sizes.
| REI Adult Hat Sizes | S | M | L | XL |
| 6 7/8-7 | 7 1/8-7 1/4 | 7 3/8-7 1/2 | 7 5/8-7 3/4 | |
| Head Circumference | 21.5-22 | 22-22.75 | 22.75-23.5 | 23.5-24.25 |
| Men's Glove and Mitt Sizes | XS | S | M | L | XL |
| Knuckle Circumference (in.) | 6 - 6.5 | 7 - 7.5 | 8 - 8.5 | 9 - 9.5 | 9.5 + |
| Hand Length (in.) | 5 - 5.5 | 6 - 6.5 | 7 - 7.5 | 8 - 8.5 | 9 - 9.5 |
| REI Sock Sizes | M | L | XL |
| Men's Shoe Sizes | 5-8.5 | 9-12 | 13-15 |
| Shoe Size Conversion Estimate-European to US | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
| Men | 5-5.5 | 6-6.5 | 7-7.5 | 8-8.5 | 8.5-9 | 9.5 | 10 | 10.5 | 11-11.5 | 12 | 12.5 | 13 | 13.5 |
Measurements stated in inches unless otherwise indicated.