Wore one time Spira Vento Men's Running Shoes with Spring is a new addition to Spira's performance running collection. The style utilizes a brand new custom developed last for superb fitting on most foot types. The upper features a stitch-less custom engineered mesh with an internal support structure creating a supportive fit. The midsole incorporates new advances to the Patented WaveSpring Technology with three hidden springs, and in conjunction with the softer density heel strike cushion pad, this model is perfect for runners and casual wears alike. Features & Benefits of the Men's Spira Vento Tri-Spring Running Shoes Performance Trainer for people with a neutral to moderate gait and who are looking for a performance trainer that provides superior shock protection on impact combined with the responsiveness of a long distance racing shoe. A mid to high mileage performance training shoe for the recreational to serious runner or walker Supports Low, Normal and High arch foot types Ortholite branded custom dual density insole. Anti-microbial, lightweight and will not breakdown over time. Removable to accommodate custom orthotics if needed. Hidden Tri-spring design: Two low profile, lightweight stainless steel WaveSprings in the forefoot and one WaveSpring in the heel provide: Superior long term cushioning Maximum resiliency and energy return Protection against fatigue, stress, shock and impact forces Lace-up closure Molded TPU arch shank for stability and support