Achy Paws Self-Warming Dog Mat (Brown) Contains Inner Layer of 100% Activated Bamboo Charcoal for Warm, Natural Relief Helps ease achy joints, especially for older dogs who can't move around as much Natural warmth helps increase blood circulation, ease joint discomfort, relieve stress & anxiety, calm restlessness, and improves sleep Bamboo Charcoal is highly absorbent of odor, moisture, & harmful toxins Simple, Safe, & Effective | Triple-Layered Fabric is Soft & Comfy | Machine Washable