Fast Trak is the quick and easy solution for radiant floor heating installations in new, remodel and retrofit applications, Uponor says. The preformed knobbed mats are available in two models: Fast Trak 0.5, which holds 5/16” radiant tubing and is only ½” thick to eliminate the need for altering baseboards, moldings and doors; and Fast Trak 1.3i, which holds 3/8” or ½” radiant tubing and includes insulation already in the mat to eliminate the added time and cost of installing insulation under the tubing.