Smartwool always thinks your first layer should be Merino. So upgrade your undies to their Womens Intraknit Bikini. Merino wool comes with a lot of natural benefits when worn next to skin, including sweat management, thermoregulation, and odor resistance. Combine that with a seamlessly knit yet supportive build and mesh knit throughout the body for breathability, and youre ready to handle whatever the day holds. And youll do it all comfortably.