Flex Rating: 5 (1 Soft-10 Stiff) The 3-D Molded Tongues wrap your foot for easier lacing, improved fit and heel hold. This design also gives 32 the ability to control the stiffness of each model for customized flex and improved response.

The Level 2 footbed has a soft EVA heel pad for additional cushioning, molded EVA for anatomical support and cushioning, molded TPU for heel and arch support, a mesh topsheet for comfort, and perforations for breathability. Articulating cuff shell construction creates high-performing, smooth-flexing boots that are easier to lace and more durable. There is also less shell distortion, resulting in consistent heel hold through the full flex range.

The Level 3 Liner has Soft Top Cuffs for cushioning around the calf, anatomical Ultralon overlays inside for optimal heel hold, dual-density Soft Touch Ultralon foam for added comfort and warmth, external overlays for support and response, Aegis™ anti-microbial coating to eliminate odor, and an all new Hook-and-Loop closure.

Designed in the STI Lab, the STI Evolution Foam™ provides better cushioning than traditional foam materials and dramatically reduces the weight by eliminating the need for a heavy rubber outsole.