Fellow Costco Shoppers: item #11 21 701, Kirkland Signature Men's Boxer Brief, 4 pack is ,,,Not Recommended. Do not keep shape , with only 4% spandex.

Buy the other ones.
Adidas, maybe.

Be aware that Champions DO KEEP THEIR SHAPE, BUT run small, so if you are a 38"-40" , get the next size up. Or suffer a too tight waistband!