Custom made to fit the airfoil shaped
spreaders used on most Catalinas including the Catalina 250, Capri 26, and the Catalina 270's lower spreaders (the upper spreaders of the C-270 are smaller. These boots will be a bit large but still the closest available fit for the Catalina 270's upper spreaders). They are also a prefect fit for the Catalina 30. They are also appropriate for the Catalina 310, Catalina 34, and Catalina 36. With it's double spread rig, the Catalina 400 spreaders also use this same size boot.
Catalina 42s have used two different sizes spreader sets over the years and these are the best leather boots for those applications as well. Your rigger should be able to install the kits without issues.
All boats should have boots on the outboard end of the spreaders. They help protect the leech of your genoa during
tacks or if a zealous crew over-trims the
sheet. On a run they protect the main from chafe when you ease the main out against the spreaders.