The Cirrus Bamboo Boxer Brief stands out in the world of comfort and high performance. Made up of 70% Rayon from bamboo and 30% polyester, the Cirrus is incredibly soft to the touch and built for any adventure. The moisture wicking capabilities of the Cirrus will quickly make this a must have for all outdoor activities. Warm enough for cold, crisp mornings and breathable enough for hot summer days, the Cirrus will keep you comfortable any day of the year.