

Darn Tough RFL OTC Ultra Light Men's Sock
Key item features
- Merino Comfort: Crafted from Merino Wool, these socks offer natural warmth and an itch-free experience.
- Moisture Management: Designed with moisture-wicking and quick-drying properties to regulate foot temperature and prevent cold, sweaty feet.
- Enhanced Fit: Redesigned for the 2021 season with increased Nylon and Lycra Spandex for a snug, performance-oriented fit from foot to calf.
- Odor Control: Merino wool's natural antimicrobial properties help reduce foot odor, keeping boot liners fresher.
- Ultra-Light Design: The "RFL" (Really Freaking Light) construction makes these socks ideal for snug performance or race-fitting ski boots.
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About this item
Product details
Tight ski boots and cold feet have plagued skiers for years; suffer no more and get a pair of Darn Tough’s RFL OTC Ultra-light Socks. The RFL is really freaking light - hence the name - and is the perfect sock for skiers who have a snug performance or race fitting ski boot. For the 2021 season Darn Tough redesigned the RFL OTC Ultra-light Socks to increase that incredibly snug hold, from the foot all the way up the calf with more Nylon and Lycra? Spandex. Darn Tough socks do a superior job at keeping your feet warm, because of the merino wool functionality. Most people don’t realize that feet still sweat when they are cold, and make those tootsies colder. The merino fiber pulls moisture away from the foot to help regulate foot temperature. If it helps keep the sheep warm, it will keep you warm as well. Merino is also naturally antimicrobial which will help cut down that rank foot smell that can permeate boot liners. Darn Tough goes out of their way to get the highest quality merino wool, so you’ll never experience itchiness in your RFLs. You can feel proud purchasing your socks knowing that they’re made locally in Vermont, but you can also rest assured if anything happens to your socks Darn Tough has you covered because these socks are unconditionally guaranteed for life. That means, no matter the age of your sock, Darn Tough will replace socks that have tears, holes, cause blisters, shrink, lose elasticity, etc. With a guarantee like that the RFL OTC Ultra-light Socks will become your most coveted sock.
- Merino Wool
- Moisture Wicking
- Quick Drying
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Customer ratings & reviews
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Showing 1-3 of 5 reviews
Quality I expect from Darn Tough
I own many socks from Darn Tough and they are true to word in holding up exceptionally well. These are called ultralight socks but I find them to be just a hair heavier then I expected but not enough to send back the ones I ordered. You can buy these and not be concerned with the quality and the fit seems to be true. Great socks.
Comfy low bulk socks.
I have to wear heavy 10inch boots regularly for work, so wanted some over the calf socks. Tried a couple of others, but they were overly bulky and didn’t stay up too well. These fit perfectly, and thin enough to be very comfortable, even with high heat work sites.
RFG socks!
I love how thin these socks are! I use mine for downhill skiing, they're the only type that are thin enough to fit comfortably in my skiboots. My feet are rarely ever cold while skiing, even at our local hill's low temp cutoff of -20F.










































































































