Wild Bleu’s sleep products feature a unique Heat Release Technology™ (HRT) developed from years of experience with endurance athletes. The fabric pulls moisture from your body and then evaporates the moisture. There are more than 40 million women in North America over the age of 50 and at some point more than two-thirds of them will experience hot flashes and night sweats. For most, these symptoms last for three to five years, but they can last longer and into a woman's 70s. Other causes of nights sweats and hot flashes include cancer treatments, pregnancy and diabetes. Their fabric was designed initially for marathon runners. Women were sleeping in the t-shirts and said it was the only way they could stay dry at night and not have to change clothes and bedding. After numerous attempts, they finally got the fabric and product that could address sleeping, lounging and resort needs. We believe you will love their products!