The dual identity of wicking layers makes the Arcteryx RHO AR Bottom ideal as a warm expedition foundation or as an aerobic midlayer. Wicking and mobile Polartec® Power Stretch® fabric provides a comfortable and solid foundation, and superior stretch won't impede intense athletic movements in this Acrteryx baselayer. A waist drawcord in the RHO AR Bottom provides a more comfortable fit, and you can store your house key or ATM card in the RHO AR Bottom laminated thigh zip pocket. A truly warm and comfortable Arcteryx baselayer.