First Defense Nasal Screens has provided a standard one-size-fits all over the years. However to improve the comfort and bring an even more discreet option to our many fans we are proud to announce the release of 3 sizes small, medium and large. If you have be satisfied with our one-size fits all version then you’ll like our large size. We have found that 70% of men prefer large, 70% of women prefer medium and for smaller sized nostrils and children our small option is a great fit. To see a sizing chart simply click into the product on our shopping page.