100% Merino Wool Felt - All Natural, Biodegradable, Renewable Material. Wool is the Most Hydrophilic of All-natural Fibers, Absorbing as Much as 30% of Its Weight Without Feeling Wet. Naturally Water Wicking, Water-resistant & Stain-resistant Absorbing Moisture From the Surface Remaining Dry, Ring-free & Grateful! Our Traditional (or Beer Felt) Are the Highest Quality German Merino Wool Felt Coasters on the Market Today. Beautiful, Functional, & Enduring - the Clean & Minimal Execution Offers an Unexpected Textural & Refined Modern Heritage Element to Any Home Decor.