The inside is made of 100% cotton, making it suitable for all seasons. The heel has elastic to prevent slipping off.

Renewal Point 1: All fabric that comes into contact with the skin is now 100% cotton, making it a durable material.
Renewal Point 2: The flannel fabric has been revised for a softer feel. The rubber heel provides a secure fit, making these room shoes less likely to slip off and more comfortable to wear.
[Material] The outer surface and the underside of the instep are made of brushed 100% cotton flannel. The sole is made of pile material for a soft feel. The sole is made of a soft, suede-like fabric that is visible when walking and reduces the sound of footsteps.
[Care] Machine washable (use a laundry net).
[Recommended] Especially recommended for those who spend a lot of time wearing slippers around the house and don't take them off often. The covered instep also protects your feet. Perfect for warmth from early fall to early spring.