Frozen over holes can be common when you are using tip ups. Check out the NEW Trophy Thermal Tip Up from Bigtooth Tackle. 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. A bit larger in diameter in size it fits over a 10 inch hole – completely insulates and seals the ice hole. Rigid high vis green flag for a maximum visual indicator from a distance.