- X SMALL- Length 22cm Boot sizes 80, 90
- SMALL - Length 26cm Boot sizes 90 / 100 / 110
- MEDIUM Length 29.5 cm Boot sizes 120
- LARGE Length 32cm Boot sizes 130, 140, 145 + 150
- X LARGE Length 35cm Boot sizes 150
Flex Back strap goes around the back of the foot, over the heel bulbs, and attaches to both sides of the boot with ball rivets. Back straps are available in three sizes and four colour options, so you can make your Flex Boots unique to you. Detailed instructions for correct fitting of the back straps are in our fit & size section, and a video tutorial can be found on our YouTube channel.
1 Flex Back Strap - All Colours