Polar Therm Extreme Tip - Up. The Polar Therm Extreme Tip-Up is freeze-proof and provides a built-in lightstick holder for marking your tip-up at night. Adjustable tension trip. Get yours now! AVAILALE SEPARATELY: Polar Therm Extreme Tip-Up, Purple; Polar Therm Extreme Tip-Up, Green - word search in our store for "Polar Therm". Polar Therm Extreme Tip-Up, Orange