Durable Cushion - dense 1/3-inch thick felt adds soundproofing and insulation; non-abrasive to protect rugs and floors from scratches; adds extra comfort underneath rugs without extra bulking. Made in the USA - 100% recycled felt needle-punched to prevent moisture buildup; odorless, low VOC’s, and hypoallergenic. Safe for floors - chemical and adhesive free, will not stain, strip, or damage hard surface flooring; safe to use with hardwood, laminate, stone, tile, radiant heat, concrete, bamboo, and more.