Men's Bamboo Rayon Boxer Briefs Performance Breathable Tagless Comfy Silk Waistband 6’’ Boxer Briefs Fly 5Pack

How do they feel for active wear, like running or playing basketball?

Can I put them in the dryer？

Is this really made of real bamboo ?

What size guide should I be using? The one included with the pictures or the one that's in the s description Bc they are toatally diffrent.