Refined heel geometry

Better foam:  Featuring Premium PWRRUN PB foam

Flatsock seams reduce chafing while internal key pocket stores essentials

the Challenger 8 delivers all the smooth cushioning and confidence-inspiring traction you'll need to tackle a variety of terrain

Hypo allergenic seamless leg openings

Men's Altra Torin 9 (2E) Wide Brand_Balega Refined heel geometryTap into unique comfort with the Torin 9. Its responsive, soft, and performance focused, so you can be uniquely you on your next road run. With an all new durable Vibram XS DURA rubber outsole, its 8. 5% grippier than the Torin 8 and made for whatever the road throws your way. An all new P35X dual density foam is built to deliver an energetic, cushioned underfoot feel by combining a soft foam with a firmer one for a stable and comfortable ride. Altra