Pay special attention to avoid overinflation. Use only a hand pump to inflate the ring. Never use a compressor. It is advisable that the inflatable ring is slightly firm to the touch. A ring that is too inflated may deform or burst in the sun. Pay special attention to temperature changes. In a cold environment, the ring will lose pressure and the air will contract. If this happens, DO NOT fill with more air, as the air will expand as the temperature rises. In a hot environment, the air expands. Some air must be let out so that the ring does not burst with too much internal pressure.