Cohesive Gauze. Increases both protection and the securing of the strap or silicone tube. Reduces slipping, and increases grip and comfort. The Cohesive Gauze should be wrapped 2-3 times around the back of the glans, and the strap should be placed right on top of it. 1 roll is enough for 4-6 uses.
Took me two tries to get the wrap tension right, but once I did, the gauze stayed put through a full day of movement. The extra grip on the strap is noticeable the moment you tighten it—no more constant readjusting. Comfort is decent too, even with the 2-3 layers it recommends.
This stuff actually holds — I wrapped it around the strap three times and it's barely budged all day, which is exactly what I needed. The grip is solid and it doesn't dig in like the tape I was using before, so it's a real upgrade in comfort too.