To make sure your swim goggles fit, place the eye cups over your eyes without stretching the straps over your head. Press the eye cups onto your eyes. They should seal and suction within a few seconds. If not, they are not a likely fit for your eyes. If they do not seal and come off easily, you may need a bigger size. Straps should not be tight or uncomfortable. Place the bottom strap around the back of your head at eye level and the touch strap slightly higher for a more secure fit. If you have an adjustable nose bridge, it can be tightened or loosened for a more custom fit.