I suffer outdoor allergies even if the copious amounts of dust generated by these activities wasn't a problem all by itself. The molded masks just don't work for me. They are not sized and the one-size does not fit me--too big. Plus, I wear glasses for yard work instead of contacts because of the dust, and the molded masks fog them up so badly, I can't see, so I quit wearing a mask and suffered the consequences.I began a search for an alternative and decided to try these. I'm really pleased with them. My glasses don't fog up as much, I like the ear loops better than the elastic behind my head and they aren't as hot as the molded masks.There's a little wire inside the top so you can customize the fit around the bridge of your nose and this mask doesn't feel so confining. I feel I can breathe more freely. Also, the skin under this mask is apparently better ventilated since it doesn't get aggravated after long use as it did with the molded mask. Judging from the amount of dust sticking to the outside of the mask after use, I'd say it is doing the job well and I haven't had any allergy problems either. Highly recommended.