Rothy's Womens The Lug Boot Merino Wool Onyx Black Size 7.5 NWOB Structured, water-resistant upper in black. Cushy insoles for added comfort and support. Lightweight rubber lug sole in black with durable traction. Chunky 1.5-in (4-cm) heel for added height. Pull tab and stretch gore panels in black make it easy to slip on your boots. Upper is knit with a blend of RWS-certified merino wool and Rothy’s signature thread (aka plastic bottles). Learn more. Along with the merino wool, it took about 14 plastic bottles to knit this pair of shoes. In 2023, Rothy’s factory achieved TRUE Platinum certification, validating that it’s operating with Zero Waste Practices by diverting solid waste from landfill, incineration and the environment. EASY TO CLEAN This style is washable, but we suggest spot cleaning to keep it water resistant. PILLOW-LIKE COMFORT Features a soft, plush footbed for easy-to-wear comfort. RECYLED PLASTIC BOTTLES It took about 14 plastic bottles to knit these shoes. Learn more. RWS-CERTIFIED MERINO WOOL Along with plastic bottles, this style is knit with RWS-certified merino wool.