calvin kleinMen's Underwear Body Modal Boxer Briefs

The option for color: black/blue shadow/mink, i am assuming this for the quantity of three?

Does the underwear ride up to your crotch when you jog?

is this made of modal or nylon? description reads 63% nylon

Are these mens size or boys size. in my cart the title reads mens. however when i click on the product it says boys. which is it?