A performance ski sock made for a women’s foot. The RFL’s are thin, ultralight Merino wool socks that work great in close-fitting ski boots. RFL stands for Real-F’in-Light, meaning these are the lightest, thinnest socks in Darn Tough’s Vertical ski line. But that doesn’t mean they are weak, since like all Darn Tough socks, they are covered by a lifetime warranty. The socks have antimicrobial properties so you can get a few days use out of them before throwing them in the wash. The RFLs are form-fitting and breathable, making them a perfect companion for ski touring or racing.