DR.LOMILOMI Small Full-round Bolster is for massage or yoga. Made from eco-friendly high-density and high-resilience molded foam and premier five-year guaranteed buttery-soft 100% PU vinyl upholstery, which is water & oil proof, abrasion-resistant. Place under the knees, ankles, abdomen, or back, provides natural support for your vertebrae and back. Care Instructions: Light stains can be removed with a damp sponge or a mild soapy solution. Protect from direct sunlight to prevent drying out.