Pure cotton velvet gives our bedding a soft, sumptuous hand and subtle sheen. In six rich colors, all backed with natural flax-hued Belgian linen, this is velvet for every season. Cotton velvet with a pure Belgian linen backing. Williams Sonoma is a proud member of the Better Cotton Initiative. Better Cotton is sourced via a system of mass balance. Learn more here. Duvet cover has a button closure and inside ties to secure the duvet. Shams have 3" flanges and flap closures.