Heavy Duty yet portable for easy storage. TFL resists scratches, dents, paint, markers, crayons, and stains.Adjustable height from 34"-42" allows for standard heights of 36", 39", 42" or anywhere in between. CST Adjstable Standing Desk (TFL) Thermal Fused Laminate (TFL) is a resin infused laminate not glued on like high pressure laminate, it is fused to the board using a heat treatment process.