ACORN Polar Moc Slipper (Infant/Toddler/Little Kid/Big Kid) 100% Synthetic Synthetic sole Lofty Acorn memory foam midsole over comfort cushion layer of featherweight EVA guarantees total comfort and happy feet Soft and warm printed fleece uppers fully lined in cozy microfleece that wicks moisture Durable suede sidewall Non-slip weatherproof sole for indoor/outdoor wear