I did my first practice run today. I put hot water (~98.8 F) in a 3oz oval shaped travel bottle ($2 @ CVS). I placed the bottle in the area between the sack and anus. I wore a pair of compression shorts under my regular boxer briefs to help keep it from sliding around. Sat down with my legs touching both sides of the bottle and measured the temp at 97.4 F after about an hour. I then drove to Walmart and did some shopping with the bottle still in my crotch and returned home about an hour later (20 min. driving/ 40 min. walking around the store). Measured the temp at 95.4 F.