Osklen is a Brazilian sportswear clothing company, owned and created in 1989 by Brazilian entrepreneur Oskar Metsavaht.
Osklen began operation in 1986, when a group of Brazilian snowboarding enthusiasts decided to climb the Aconcagua, the Americas' highest mountain. At the time, it was hard to find athletic clothing in Brazil that was suitable for extremely cold environments. Responding to this need, Oskar Metsavaht, a sports medicine specialist and one of the mountain climbers, created the Storm Tech System, a fabric permeable to transpiration and protective against cold, and designed a range of snow jackets. The climbing was broadcast on TV, and the clothes became famous. Oskar Metsavaht gained further publicity when he became the first Brazilian to scale Mont Blanc. Then, in 1989, Metsavaht founded the Osklen brand. The company opened its first store in Búzios, Rio de Janeiro, offering a winter sportswear collection. Though the company started out selling cold-weather clothing in a warm-weather environment, in a few years, it expanded the product line into a 'lifestyle' fashion line that includes laid-back, surf-inspired aesthetics and an environmental focus.