I have the Bare strapless 2 mm neoprene caps that work great for warm water diving. Mine has a yellow band, my wife has a red band. Helps us know whose who. I'm afraid they may only be in black now. Anyway, I don't like the strap around my chin and this works great for me. Use it almost always unless water temp is above 84 degrees. I even use it at our quarry until the water temp is below 72. Yes, perforation at the top helps stop that big bubble.
Rob
Rob