A lightweight durable bib short that can be worn while training or on race day.
They're lightweight, have saddle padding, and they offer great support. We'll go so far as to say they're possibly the best thing to wear when you're on a bike.
Which is good news because they're not so hot for a lot of other things:
Taking a lady out for a first date? We wouldn't recommend this outfit. First day at a new job? Probably better if you stick to something formal.
Do you have the privilege of being the emcee for an upcoming wedding? Definitely don't wear this.
...or do? The bride will hate you forever but it'll make for an unforgettable wedding ceremony.