The liner height is approximate. For a more accurate measurement of the height of the liner, please see the sizing chart. This Boot Liner is composed of three layers of space age technology: RadianTex™ on the exterior to reflect the cold, a middle layer of 18% wool felt for insulation and to lock in moisture, and a 77% polypropylene inner lining to wick moisture away from the foot with 5% miscellaneous fibers. It is crafted in a "skidoo boot" style with heel reinforcements for extra support and is 8 mm thick. Suitable boots are Sorel Boots, Columbia Stuttgart Hunting Boot, Columbia Midnight Hunting Boot, Itasca Swampwalker II Mens Insulated Boot, Columbia Willamette Hunting Boot, Proline Hidden Trail 2 Camo Boot, RedHead Bone-Dry Hobbs Creek, all RedHead Fishing Boots, and White Creek Fishing Boots.
To use our sizing chart: Measure your foot while wearing your socks. You would then add 0.75" to both of the measurements to account for the stitching. For example, if your foot is 4" wide and 11" long (with your socks on), the measurements you would look for on the chart would be 4.75" wide and 11.75" long. This would give you a Liner Size of 9/10.
**The sizing in the chart is approximate and may have a +/- 0.25" tolerance**