The Tykky shoes are made on Pomar's "J-last." This last is the second largest of the five women's lasts and is designed for very wide feet, or situations where there is foot swelling, tenderness, and/or when using custom orthotics. Pomar's winter Grip soles combine two materials: the edge of the sole has more a durable rubber compound, while the middle utilizes extra grippy, soft rubber. You don't have to compromise on style even with a wider lastTykky is a truly striking choice! The fit of the shoes can be fine-tuned with laces, and for everyday use, they can be conveniently put on and taken off using the zipper. - J-last for ample space - Waterproof Gore-Tex membrane with warm Partelana lining - Upper material: high-quality leather - Wool blend in the lining layer - Removable gel insolesyou can replace them with your own if desired - TR rubber outsole stays flexible even in freezing temperatures