Honestly, if Gladio knew no one else was going to come around and it would just be the guys he'd have done without the boxers. Not like they hadn't all bathed in the Wennath before.

Gladio grinned, splashed some water at Prompto's face, and then bent down to let the water get into the underside of his hair, making a soft disgusted noise at how matted it was getting after only a week. "What? You think I only read romances?"

Which would be a fair assumption since he'd actually come to the island with one in his back pocket but that's not proof. Besides, once upon a time he'd had quite a lot of down time in a car and internet access. Instructional videos were the best and with how much camping they'd been doing he'd kind of always wanted to do more than just use Ignis' little camp stove.