I have for years worn women's watches. Partly, I have smallish wrists for a 6'0" guy, but especially for BPing and death marches, a Swiss Army women's model has the same features as the men's, but in a smaller, lighter package. And men's watches have gotten so huge of late, weighing 3-4 times what a smaller one does.
My 12-year-old son has a women's digital watch with an integral plastic band that is totally bomber. He swims with it, showers with it, climbs trees, builds snow forts - he's worn it almost continuously for the last 3 years. It was $19 or $24.