Keep your feet warm and cozy all winter with these Fleece Self-Heating Thermal Insoles. Made with highly elastic memory foam and breathable cotton wool, these insoles offer superior comfort and support. The U-shaped heel cup provides ankle protection and prevents slippage during activities. Designed to be easily trimmed, they ensure a perfect fit for any shoe. Perfect for snow boots, sports shoes, or everyday wear in chilly weather. - Material: Memory Foam and cotton wool - Size: 35-36, 37-38, 39-40, 41-42, 43, 44-45 - Color: Light grey, dark grey, black and grey