The Impacto Sorbo-Air insole is made of sorbothane, is packaged 16 pair per case and comes in blue/yellow. Proper sizing is important when buying this SKU. The size for this product is 9.5 to 10.5. These types of SKUs are designed for specific applications which feature ways of safeguarding & shielding itself and/or the user. This SKU is designed and manufactured such that it offers the following protection: Shock Absorption.