Easily removable with velcro for warm weather driving. I used them for one season on my GTS, my hands were toasty. I attached the control unit inside my glovebox with velcro. I think these would work much better for someone with larger hands. The grips added a lot of girth for my small hands to grasp. My new GTS has heated grips so I don't need these anymore.
More info here: https://www.revzilla.com/motorcycle/oxford-hot-hands-heated-grips