Is this thing waterproof?
This airtag case has a built-in silicone ring, which can effectively waterproof.
Once installed, can the airtags be removed and replaced while remaining connected?
Yes, this is a two-piece design. They snap on and off, so you can insert the air tag or remove it. I hope this helps.
Can you mount it on a set of skis or snowboards? Will it come off quickly when it gets wet?
You can put it on. We have tested them and never had a problem with them getting wet and coming off.