LUCID 1/2" Quilted Memory Foam Mattress Pad with Bamboo Cover - King Polyester Half-inch soft memory foam layer increases mattress comfort Ultra-soft and breathable rayon from bamboo fiber cover creates a cool sleep environment and is quilted for improved airflow and comfort. (40% rayon from bamboo, 60% polyester) Fitted sheet-style mattress pad with oversized elastic ensures a secure fit for all mattress depths from 6" to 22" Machine washable fabric and foam are hypoallergenic to help prevent allergen contamination on the mattress King size mattress pad measurements are 76" x 80"; protected by a 3-year warranty