What is the HEIQ V-BLOCK® treatment? October 05, 2021 15:32 HeiQ V-Block technology protects the inner fabric pocket from microbes and germs. For more information about HeiQ V-Block visit this website. Related articles Can I use BUFF® Filter Mask in hot weather? When I use the BUFF® Filter Mask or BUFF® Filter Tube, am I protecting others from getting COVID-19? How many sizes of BUFF® Filter Tube are available? How do I wear BUFF® Filter Mask safely? Besides the BUFF® Filter Mask and the BUFF® Filter Tube, are there other BUFF® products with tested filters?