The most accurate use for N-95 masks are to reduce or eliminate particulate inhalation. In the medical setting their primary use if for protection against SARS, TB, etc..... In general use they are your frontline defense for dusty conditions especially those such as drywall work, construction, strucural collapse senarios, mining, etc. There are several version of this type sold, as well much heavier versions, but again with increased procections you start to increase in bulk size and weight. Thats simply why the "typical" n-95 mask is so popular-reputable protection for small size and very minimal weight. The valve mentioned helps to reduce moisture, heat, and prevent any fogging of eyewear. As far as the straps go, you could always upgrade them simply with a stronger piece of elastic cord which you can buy at any fabric shop and attach it with a stapler. Hope this helps