Brooks Run Within Sweatshirt – Women's size-11-5 Merino wool naturally regulates temperature

Merino wool naturally regulates temperature and resists odor — a real advantage in Southern heat — while light cushioning and reinforced heel and toe keep feet comfortable through heavy rotation

DryVent waterproof membrane paired with a durable ripstop and mesh upper keeps feet dry without trapping excessive heat

Reflective sleeve details add visibility when the light gets low

Synthetic insulation retains core warmth even when wet — reliable in the unpredictable Southeast shoulder seasons

Brooks Run Within Sweatshirt – Women's size-11-5 Merino wool naturally regulates temperatureBuilt for those in between days when the air is cool but you're still putting in work, the Run Within is our pick for runners who want a true training layer without the bulk. Moisture wicking exterior and a brushed interior manage sweat while keeping warmth close, so you stay comfortable when temps drop but effort stays high. Reflective accents and stretch fabric round it out for early morning miles. Brushed interior traps warmth without adding weight