Bamboo Boxers (3 Pack) | Dirt Bike, Bulldozer & Monster TruckSoft bamboo viscose blend with thick elastic band for a secure fit. Material: 95% bamboo viscose and 5% spandex. Available sizes from 18 months to 9 years. Print options include Dirt Bike, Bulldozer, and Monster Truck. Naturally hypoallergenic and gentle on skin. Highly breathable and moisture wicking. Helps keep skin cool in warm weather and warm in cold weather. Wash on a gentle cycle with cold water to minimize wear. Avoid overloading the machine