Solid Navy 550 Thread Count California King Size Sheet Set, 100% Cotton Deep Pocket Bed Sheets 550TC. Cotton Experience true luxury when you sleep on these woven solid cotton sheets 550 thread count. Set includes flat sheet, fitted sheet and two pillowcases 600 thread count.Thread count is the number of threads per square inch of fabric--the higher the thread count, the thicker, more durable and longer lasting the material Fitted sheets will fit mattress up to 18 inches deep ,Elastic all around for a perfect fit Machine wash.Softness enhansed with each washing