These xxxcs are really hard to find because they are very popular and they work well. They don't stretch and repel flies. I had to wait over 6 weeks for a pair from the website I order from. They said they were in stock and the next day I got an email saying both pairs (different sizes and colors were out of stock) so I went here and got them 2 days later. Thank goodness because I bought a different brand of flu boots, they were actually the same brand as the bed sheet I bought and within 2 days their backs were spraining and could get under their hooves (which seemed dangerous to me. I don't want her to penetrate her).