No. This product can only be used with a rigid drop-in bed liner.
The UnderLiner measures 0.065" thick.
You cannot use the UnderLiner with the TechLiner. The UnderLiner is designed to work only with a rigid drop-in bed liner.
TechLiner is a custom-fit pickup truck bed and tailgate liner that protects and shields the truck bed against scratches, dents, paint damage and rust. Underliner protects your pickup truck bed by creating a semi-soft protective barrier between a "drop-in" style bed liner and the painted surface of your truck’s bed.
WeatherTech® is a line of top-grade custom-designed automotive accessories produced by the MacNeil Automotive Products Ltd, a company headquartered in Downers Grove, Illinois. Manufactured in the USA, the WeatherTech line offers everything you need for protection of your vehicle's interior and exterior, from lamp guards and window deflectors to liners and pet barriers. All WeatherTech products are thoroughly designed and manufactured, so that you could get the uppermost quality, styling, and durability. Every product undergoes the most rigorous testings and quality control inspections before being marked with the MacNeil logo. Thus owners of the WeatherTech products no longer have to worry about Mother Nature and its effects spoiling their vehicle's exterior or interior.