PRO TOUR liners are best for backcountry, tele, and touring applications. A lace up, tongue style liner available in 3 Volumes: HV (High Volume, thickest), MV (Medium Volume), and LV (Low Volume, thinnest), to accommodate a range of shell fits. These dual-density, light weight liners feature a softer flexing lay-up, and a roomy toe box for maximum comfort on long tours. The strategic rear panel, flexible tongues, and supple cuffs increase range of motion and performance for ascending, while optional stiffer, thicker tongues are available to further enhance the descent.