Bring your body into balance for a good night’s sleep with technology used by astronauts and Olympic athletes! Goodnighties® patented Ionx® sleepwear is infused with negative ions to wick moisture and balance the ill effects of positive ions in the environment. The result? Cool comfort and soothed muscles for a better, more restful sleep. Goodnighties Sleepwear is a natural solution for better sleep! 88% polyester/12% Lycra®. Machine wash (no fabric softeners). USA.