After trial and error testing of different mask designs I believe this 3D design gives a better fit to one's face, with soft ear loops and soft flexible nose wire - you can breathe easy. 
Made to order. Supplied with one filter. These filters last one week of consistent use. More filters can be ordered via Amazon.
 
I recommend:
PM2.5 Replaceable Filters for Adult (10 PCS)
by WELT
Learn more: https://www.amazon.co.uk/dp/B086WBM2T9/ref=cm_sw_em_r_mt_dp_I1nDFb6F84GJ8