Insulated / Overboot gaiter from Outdoor Research. Brand new, with packaging and stored in the plastic they shipped in. Bought them direct from OR for $150, unfortunately they are too small for my size 45 G2 SM double boots, and I missed the return window.

The size is Large. OR says that works for sizes 10.5 – 11.5. I'd recommend them for 10-11.5 single boot, or below size 10 double boot. Happy to send size/fit pic or, if you happen to be in Seattle, WA, come try them on. Asking $90, plus buyer covers shipping. I'd trade if you have size XL somehow, or other large overboots.