How to care for your sheets:

Cold wash, maximum 40°C on a gentle cycle
Wash separate to other laundry and with all zips closed
Do not use bleach or fabric softener 
Use a gentle detergent
Line dry or tumble on a cool setting
Iron on low setting
Low spin setting on washing machine
Washing sheets inside out and in a laundry bag, if a large one is available will minimise the friction from machine washing and help maintain the smooth texture of your sheets.