These are the most breathable and well-fitting undies I've ever bought. The legs have excellent elasticity and the 'pouch' is an extra breathable material. The fly works really well without affecting the look or feel. I wear a medium and I prefer a slim waistband, so these are perfect. I paid less than $5 each, $8.81 per 2-pack. That's an incredible deal and I'm going to buy more at this price.