• Warm and cozy insoles: made with premium quality 20 mm thick sheepskin, enhanced in 2021 to provide warmth in winter. • Thick felt layer: hand-sewn, breathable, and with constant temperature to keep feet comfortable. • Durability and washable: the fluffy fleece and high-density felt prevent crushing, are hand washable. • Humanized design: ergonomic design that provides the best cushion and prevents injuries from incorrect support. • Perfect fit: ideal for UGG boots, slippers, work boots, athletic shoes, and more.