Spenco Polysorb Heavy Duty Insoles Leather They feature a polypropylene shell

They feature a polypropylene shell that is layered with memory foam for a custom-like fit

They have ribbed bands at the achilles tendon and arch that offer added support to alleviate aches and pains

giving you plenty of support while also alleviating pressure from the foot

A few notes on Birkenstock's "width" classifications

The Protalus M75 Orthotic Insoles are 3/4-length and feature a semi-rigid orthotic arch support

Spenco Polysorb Heavy Duty Insoles Leather They feature a polypropylene shellOverview The Spenco Heavy Duty Insoles were designed to provide maximum cushioning and pressure relief and lightweight, gentle support for those on their feet for long periods at a time. Featuring thick cushioning throughout and a fully flexible cushioned arch support, these insoles will provide gentle arch and heel support while also providing maximum cushioning and shock absorption no matter your day to day routine. For those looking for max