The HP1 BL is the Dainese First Layer specifically designed for those who wants to push past their limits & conceived to satisfy the needs of most demanding skiers. Years of research into the dynamics of the human body have helped determine which parts of the body are never extended or contracted, despite movement. By joining these points along “non-extension lines”, the pressure placed on the body is kept constant. This research helped Dainese engineer the BIOSUIT, designed for NASA astronauts, & was the inspiration behind the structure of the HP1 BL M SHIRT/HP1 BL L SHIRT. Seamless technology & the Dryarn fabric are combined togheter to provide great insulation with maximum breathability, coolness & comfort. Meanwhile, the “non-extension lines”guarantee a compression effect that helps keep muscles in position when skiing. What’smore, the ¾ trim, provides great practicality of use, even when wearing technical socks. Features Bacteriostatic, hypoallergenic & anti-odor Differentiated weaving with compression areas & interwoven mmicromesh sections for enhanced airflow Mapped body “lines of non-extension” Micromesh sections for enhanced airflow Seamless build for superior comfort