At the beach, when it comes to clothing, we want to look good, but we are not so focused on fashion. What we want is to be comfortable, and beach pants are just that. They are made to be light, airy, and adjustable. They usually come in white or beige, but other colors are available. The reason light colors are popular is that they help reflect the hot rays of the sun, and thus help keep you cool.
Here’s a model I like: These can be folded up, becoming like clamdiggers or mens capris:
Mens cotton beach pants pictured: Akademiks Young Men’s Beach Comber Light Weight Cargo Pant