Smartwool Active Long Sleeve – Women's Size:S breathable fabric keeps airflow moving

breathable fabric keeps airflow moving during runs and warm-weather training

while the recycled raschel fleece lining makes it genuinely comfortable against skin

and anyone who takes UV exposure seriously

Merino wool construction naturally regulates temperature and wicks moisture — no synthetics needed

while 200g insulation and a Solarcore Aerogel insole stack warmth from the ground up

Smartwool Active Long Sleeve – Women's Size:S breathable fabric keeps airflow movingFor high output trail days and gym sessions where you need a top that pulls its weight, the Active Long Sleeve is our go to merino pick for women who run hot and work hard. A merino wool blend regulates temperature naturally and kills odor without synthetic buildup, while the stretchy, lightweight construction stays out of your way when the pace picks up. Merino wool blend naturally regulates body temperature and wicks moisture no synthetic smell