Men's Sonicblast (400 - Winter Sea/Stillwater) Size:9 folding cups designed to be

folding cups designed to be used quickly

Altra went all in on tech so you can go all out on the trail

secure and effortless ride – whatever your adventure might bring

Measure circumference just below patella (knee cap)

Men's Sonicblast (400 - Winter Sea/Stillwater) Size:9 folding cups designed to beThe SONICBLAST shoe offers a lightweight and responsive ride that makes it functional for tempo runs and your daily training. The midsole features a two layered foam with FF BLAST MAX and FF TURBO cushioning to help create a lightweight, bouncy, and advanced cushioning running experience. Additionally, an ASTROPLATE propulsion mechanism is centered in the foam. This helps propel your momentum forward, creating a faster feel underfoot. Style 1011C083