Best tip up for extreme cold! Frozen over holes can be common when you are using tip ups. Check out the Trophy Thermal Tip Up from Clam. A thermal foam liner is completely sealed for durability and comes with a handy tackle compartment that has its own secure spot on the tip up. It’s designed with a larger diameter to fit over a 10 inch hole and it completely insulates and seals the ice hole. Rigid high red flag for a maximum visual indicator from a distance.