• Insoles 7mm heel to 5mm toe
• Fits in most shoes
• Embossed skeleton logo bottom with tough skin
• TPU layer under fabric for extreme durability
• Absorbs more than 90% of shock energy in astm f1614 lab tests
• Same formula used for NASA

Sizing = Small 4-7.5, Medium 7-10.5, Large 9-14.5