1.5" block heel made of recycled plastic Cushioned foam mid-sole for all-day under-foot comfort Embossed patent calf upper, chrome-free leather strap, and synthetic rubber sole Slide can be worn with most Alterre straps and detachable Twiggy strap can be worn with any Alterre shoe base Available in regular full sizes 6 - 11 and half sizes 6.5 - 8.5. Don't see your half size? We suggest sizing up.