40.7-42mm Binocular Rainguard/Eyepiece/Eyecup Cover/Dustguard/Eye Guard Cap Rubber Black, 40.7-42RG

This "Generic" brand rainguard is exactly what I wanted. The 42-43 mm size fits my Swarovski 32x10 NL Pure binoculars like it was made for them. (The outside diameter of the Swarovski eyepieces measured 42mm.) It is made of a soft rubber which is slightly grippy and conforms nicely to the eyepieces, so it's easy to put on and take off but won't fall off. I prefer it to the one that came with the binoculars which is bulkier and more rigid, and somewhat difficult to remove quickly.

Perfect fit for our Sig Sauer binos. They came with two separate caps. Who wants to deal with that? Almost always when I’m using the binoculars at home it a rush to see something before it’s too late. This set of connected lens caps is perfect. I don’t have to worry about dropping them, I installed a tether to the loop provided. They’re tight enough to stay on but loose enough that removing is easy.

This eyepiece protector fits my binocular eyepiece fine. It works but I'm not overly impressed with the left side binocular strap holder. It's an open ended holder for that side strap, instead of being closed-ended like the other side. The design for that reason is not great, but I will say that for being China made, the rubber seems to be of decent quality, though I haven't used it yet in the field.

This is great quality and worked perfect to replace my missing vortex razor 12 x 50 bino cover.

Perfect fit for my new Sig Sauer Zulu6 12x42. Just right and designed nicely. Originals are just simply sized too large and puzzling because if you can design such great binoculars, I know this fix is a cinch.....

If you measure the size of the objective you are wanting to cover, these will fit nicely. The rubber/plastic is heavy and flexible. I am actually surprised at how resilient it seems. With a bit of heat from a hair dryer or heat gun, it will conform and fit even better. I was reluctant to take the risk as the items are expensive for what you actually get, but they work and replace old and lost covers that did not fit well and broke/cracked. This is a good buy if you value your optics.

A little snug at first, over time a perfect fit. Better snug than to loose.

works ok but you better tie them off or you'll lose them.