Compression level: compression garments are made in a variety of support levels, each of which is designed to address different needs. these levels are most commonly expressed in millimeters of mercury (abbreviated as mmhg). generally, graduated compression is displayed in ranges. the higher the numerical value, the stronger the support level indicated. for example, a 20-30 mmhg garment will offer more support and feel tighter than a 15-20 mmhg garment.all of vim & vigr’s products are offered in 15-20 mmhg compression level and select styles are available in 20-30 mmhg. our 15-20 mmhg is appropriate for all-day, everyday wear and our 20-30 mmhg offers moderate-severe levels of compression.