Keep your kids warm and dry with the Swix Racex Classic Pants Jr! RaceX base layer pants have long been the most popular base layers thanks to their stretchy construction, light weight and next-to-skin feel when worn. Although the fabric is hydrophobic and quick-drying, its structure has been designed to effectively absorb moisture from the skin's surface, which is why the garment feels so comfortable and regulates temperature excellently during intense physical activity.