Ranger 15" Men's Thermolite Insulating Liners for Men's Pac Boots (A417) Extra-thick 3/4" foam insulation to keep your feet warm in cold environments Thermolite liners are removable and washable to maintain freshness in your work boots Replacement liners for most fabric or leather-top pac boots Fits Men's Pac Boot Models A485, A486, A487, RP117