Product details:

The Hydro Glide Saddles are Thule's alternative to rollers. Unlike rollers, the Hydro Glide has no moving parts to break or jam, just super slick felt pads that let you slide the bow through into the forward saddle, then act as a saddle themselves. The Hydro Glide works especially well with the Set-to-Go saddle, with the Hydro Glide on the back bar and the Set-to-Go on the front. For a complete pack with both saddles, see the Glide & Set.