The size runs small so we recommend buying one size up. Meet Silja Warm leather, WODEN's kids boot crafted in certified leather with a convenient inside zipper for easy wear. Designed with warm wool lining to keep little feet cozy, warm and dry. - Certified leather from LWG - Upcycled fishleather with ASC certification - Inside Zipper - Warm lining with 75% wool - Durable lightweight midsole - Durable outsole in 100% rubber with 10% recycled rubber