Description of Keen Sayulita Slip On Shoes Make time for yourself with the Sayulita Slip On from KEEN. The non-marking natural rubber outsole is flexible with a steady grip. The super casual design allows for easy transitions to weekend relaxation. Features: Weight: 7-15 (1/2 Thru 12) Lining: Non-marking natural rubber Rubber: 10.3 oz/292 grams Upper: Unlined Deconstructed slip-on design for added comfort Recycled PU and cork footbed with leather covering Suede upper