Sizes are in US Mens Sizes. To find the right size, check Intuition's Sizing Chart here. 

Introducing the Pro Tour Liner... Custom designed for serious backcountry skiers. This liner offers a removable medium flex tongue which accommodates both AT and Tele riding styles (a softer tongue is optional), rapid lace closure system, a strategic flex panel in the rear of the liner with a supple upper cuff. These elements are included in this liner in order to alleviate any undue pressure whether ascending or descending. Intuition’s incredible heel hold down power where you need it most is combined with a medium volume fit, making this the ultimate backcountry liner. space space 

Specs: