Hi-tech Chic recommends Dagsmejan's thermal pajamas in their 2019 Holiday gift guide:
"A Swiss-Swedish sleepwear brand scientifically designed to help you get your best night’s sleep by combining the finest natural fibers with the latest sleep technology. Their men’s and women’s individual sleepwear pieces start around $75.00 and go up from there. Also their site also has giveaways during the month of December.