There are 4 main compression levels which are measured in millimeters of mercury (mmHg)

Discreet embroidery tone-by-tone down at left side

Small logo in jacron down at left arm

soft and comfortable fine Merino wool with the feeling of cashmere

The material has a nice slub effect

JOJJE HALF ZIP, 100% EXTRA FINE MERINOULL — BLACK Variant:XXL There are 4 main compressionA new super comfy material! Super thin, 18 gauge half zip style in 100% merino wool, mulesingfree. Plain knitting, but with cool accent colours on zip and embroidery. This must be the best midlayer ever! Half zip with extra length Accent colour on zip and embroidery Super thin and stretchy Wool is mulesingfree OEKO TEX certified zippers 100% Merino Wool Extrafine 1. Hang the garment out for airing 2. Wash in wool program.