About this item A revolution in sound performance, with foam that expands at the perfect rate. Enjoy crisp, clear sound and comfort for an all-day immersive experience. Memory foam is a degradable material; each pair should last up to 4 weeks. Designed to fit perfectly inside the charging case. Available Sizes: Small, Medium, Large & Tester pack (S/M/L). Dimensions: 0.51 x 0.51 x 0.33 inches.