Introducing the Tacx Towel. When you are training in the walls of your house you don’t get the same cooling as you does if you were outside. Rain and wind act as great cooling aids when outside, and when you have neither in your house you will only heat up more. Thats is why it is important to have a towel with you, to stop sweat running into your eyes and onto your carpet or wooden flooring. Sweat is actually a corrosive liquid so watch out for it if you are training indoors.