A soft to the touch 165GSM (5.82oz) organic cotton natural flannel California King fitted sheet perfect for cooler weather. The organic cotton has a cooler feel than polyester due to its natural breathability. Due to it being flannel, it is slightly warmer than sateen would be, though not as warm as fleece. Flannel is also naturally more wrinkle resistant. Softens further after washing. Machine wash and dry on regular. Add 1/4 cup of vinegar to the load to increase softeness. Fabric is not pre-shrunk and will shrink to the proper size once washed and dried. Covered elastic is featured around the entire fitted sheet to ensure the best fit. Made in the USA. Ships within 1-2 business days.