Internal product tests and feedback from our customers seem to indicate the following sizing:
| SMALL | NORMAL | LARGE | |
| UPPER TEXTILE | X | ||
| LOWER TEXTILE | X | ||
| SHOES | X |
| Mammut men's upper clothing | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| French sizes | ||||||||
| US sizes | ||||||||
| Adult sizes (in cm) | ||||||||
| Chest circumference (in cm) | 88-91 | 92-99 | 100-107 | 108-115 | 116-123 | 124-131 | ||
| Waist circumference (in cm) | 74-77 | 78-85 | 86-93 | 94-102 | 103-112 | 113-121 | ||
| Hip circumference (in cm) | 87-90 | 91-98 | 99-106 | 107-114 | 115-122 | 123-130 | ||
| Mammut men's lower clothing | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| French sizes | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 |
| US sizes | ||||||||
| Adult sizes (in cm) | ||||||||
| Waist circumference (in cm) | ||||||||
| Hip circumference (in cm) | 87-90 | 91-94 | 95-98 | 99-102 | 103-106 | 107-110 | 111-114 | 115-118 |
| Mammut women's upper clothing | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| French sizes | 76-80 | 81-85 | 86-91 | 92-97 | 98-106 | 107-114 | 115-122 | |
| US sizes | ||||||||
| Adult sizes (in cm) | ||||||||
| Chest circumference (in cm) | 76-80 | 81-85 | 86-91 | 92-97 | 98-106 | 107-114 | 115-122 | |
| Waist circumference (in cm) | 61-65 | 66-70 | 71-75 | 76-81 | 82-90 | 91-99 | 100-108 | |
| Hip circumference (in cm) | 84-88 | 89-93 | 94-99 | 100-105 | 106-114 | 115-122 | 123-130 | |
| Mammut women's lower clothing | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| French sizes | ||||||||
| US sizes | ||||||||
| Adult sizes (in cm) | ||||||||
| Waist circumference (in cm) | 62-64 | 65-67 | 68-70 | 71-75 | 76-80 | 81-86 | 87-92 | 93-98 |
| Hip circumference (in cm) | 84-87 | 88-91 | 92-95 | 96-99 | 100-104 | 105-109 | 110-115 | 116-121 |
| Mammut men's gloves | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| Hand length (in cm) | 16-17 | 17-18 | 18-19 | 19-20 | 20-21 | 21-22 | 22-23 | 23+ |
| Mammut women's gloves | ||||||||
| International sizes | XXS | XS | S | M | L | XL | XXL | XXXL |
| Hand length (in cm) | 16-17 | 17-18 | 18-19 | 19-20 | 20-21 | 21-22 | 22-23 | 23+ |
| Mammut men's shoes | |||||||||||||||||||||||
| EU (FR) sizes | 39 | 39.5 | 40 | 40 2/3 | 41 1/3 | 41.5 | 42 | 42 2/3 | 43 1/3 | 43.5 | 44 | 44 2/3 | 45 1/3 | 45.5 | 46 | 46 2/3 | 47 1/3 | 47.5 | 48 | 48 2/3 | 49 | 49 1/3 | 50 |
| UK sizes | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 13.5 | ||||||||
| US sizes | |||||||||||||||||||||||
| Length (in cm) | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | 30 | 30.5 | 31 | 31.5 | 32 | ||||||||
| Mammut women's shoes | |||||||||||||||||||||||
| EU (FR) sizes | 35 | 35.5 | 36 | 36 2/3 | 37 | 37 1/3 | 38 | 38 2/3 | 39 | 39 1/3 | 40 | 40 2/3 | 41 | 41 1/3 | 42 | 42 2/3 | 43 | ||||||
| UK sizes | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | ||||||||||||
| US sizes | |||||||||||||||||||||||
| Length (in cm) | 22 | 22.5 | 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | ||||||||||||
