Superior energy return for better performance.TRP Gel Thermoplastic Rubber responds with 44% energy return. Anatomical Cushioning System Dual Density Gel absorbs shock. Heel Cupping provides extra cushioning and stability for the heel. Correct arch placement for better fit, comfort and performance provides superior energy return for performance.Spenco model #39-719

Soft Support for the Arch. Same long-lasting quality insole material as the slip-in insole but with an added soft arch cushion for extra comfort. Full length cushion for heel to toe comfort. Reduces foot discomfort and arch compression caused by constant pounding. Soft arch cushion absorbs impact, shock and side-to-side friction. [...]

Daneli Comfort Sock features: Anti-bacterial & deodorizing Extra padding in ball and heel Protective non-irritating flat seam Perfect fit – stays in place Soft [...]