Golden Pot Personalized Warm Cotton Slippers | FlannelPersonalized Warm Cotton Slippers Flannel Material description: Flannel and cotton. Product Performance: The soles are made of non slip material and can remain stable even on slippery floors. The padding inside is thick and provides good cushioning to protect your feet from cold, hard surfaces. Warmth: The internal filling of cotton slippers has good thermal insulation properties, which can effectively lock in heat and keep your feet warm in winter.