Description of Keen Sienna Stretch Ballerina Slip-Ons - Women's The Sienna is built with a trick - the stitches are hidden and the style is cool. Made to stand out, have no fear: you will. Features: Upper: Canvas Weight: 11 oz / 198 grams Lining: Leather Rubber: Non-marking, natural rubber with cork Canvas upper with elastic collar for a great fit Removable jute, cork, & natural latex footbed Low profile natural rubber & cork outsole