We will take a otter pop package and fill it with 98.6º water(human core temperature). Then we will take each of the sacs made of wet suit, t-shirt, and rash guard and put the otter pop package in it. Next we will submerge the sacs in cold and warm water for 1 min, 5 min and 10 min. While the sacs are submerged in the water their will be a temperature sensor recording the changes in the temperature of the water in the otter pop package. Which ever fabric works the best is the one that will keep you the warmest the longest.