How to use: Simply pull the beanie over your head. It's one - size - fits - all, so it should fit comfortably on most heads. Attention: This product has chemicals that might be harmful, as per California Proposition 65. Keep it away from children and pets if possible. Maintenance: You can gently hand - wash the beanie in cold water with mild detergent. Don't wring it out; just press out the excess water. Then, lay it flat to dry. Avoid hanging it as it might stretch out of shape.