Is The band on this watch stretchy? I need something totally waterproof that would fit a man who is heavy, about 350 lbs) and has a large wrist? I'm looking for something that will never be taken off and will be worn every day in the shower. This is for a nursing home patient. Every watch seems to be stolen, so I'm looking for something that is not to be removed for showers, etc. I like the features of the lighting etc. Do you have other suggestions?