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The best life guarantee socks, from Darn Tough. These socks contain 59% Merino Wool, 38% Nylon, 3% Lycra Spandex. The merino wool has great properties. Like odor resistant, controls moisture, biodegradable and temperature regulating.
Source
Darn Tough Hiker Quarter Midweight Hiking Sock(US only): https://darntough.com/products/mens-merino-wool-hiker-quarter-midweight-hiking-socks?variant=41060784046266
Official website: https://darntough.com/
Warranty: https://darntough.com/pages/our-unconditional-lifetime-guarantee
Alternative sell point:
Dutch Mud Men: https://dutchmudmen.com/collections/darn-tough
Berg Freunde: https://www.bergfreunde.nl/merken/darn-tough/merino-sokken/