Sleep Master - 4" Memory Foam Topper with 2" Memory Foam, plus 1.5" Ventilated Air Flow Foam with 0.5" Cool Fiber Quilted Luxurious Cover - Full Top layer of 0.5" quilted super soft fiber padding for extra cushion & coolness a 2" thick layer of premium-quality memory foam 1.5" Ventilated Air Flow Foam base layer Memory foam is resistant to dust mites and naturally antimicrobial. Meets all Federal FR standards