CE-approved Class 2 SIXS compression sock. Thanks to its special variable density fabric, it compresses muscle fibers at the right points, promoting blood circulation and thus oxygenation of the tissues. This avoids the accumulation of lactic acid in the calf muscles delaying fatigue, dramatically reducing recovery times. Can be used in pre-activity to speed up heating, during activity to increase performance, or immediately afterwards to reduce recovery time. The polyamide yarn of which the product is made, with parallel construction, guarantees perspiration and sweat expulsion.