Superfeet Carbon Size:B 4.5-6/2.5-4 A C-Shell membrane protects from

A C-Shell membrane protects from the elements and keeps feet dry

and more — everything you'd want from a medium-sized wallet

Microfleece lining

Removable Insole: None

Superfeet Carbon Size:B 4.5-6/2.5-4 A C-Shell membrane protects fromGreat for Slim Fitting Athletic Footwear Breakthrough technology uses the strength of carbon fiber with ultralight foam to create one of the most innovative, high performance Superfeet insoles ever. Made to fit well in moderate to slim fitting athletic footwear, like running shoes, bike shoes and cleats. Trim to fit your shoe size. YOUR PURCHASE MAKES A DIFFERENCE Every year, Superfeet donates 1% of sales and 1,000+ volunteer hours to organizations