Smartwool Women's Baselayers

Frequently Asked Questions

• What are the main differences between Smartwool's Classic Thermal Merino, Classic All-Season Merino, and Intraknit baselayers?

  Classic Thermal (Merino 250, ~250gsm) is a mid/heavy-weight, mostly 100% Merino option built for cold-weather insulation and multi-day warmth; Classic All-Season (150gsm) is a lightweight 88% Merino/12% recycled nylon jersey for higher-output, milder conditions and faster drying. Intraknit uses body-mapped knit zones and stretch for targeted ventilation and mobility during high-intensity activity in cool to cold temps.
• Which Smartwool baselayer is best for skiing versus high-output trail running or backcountry touring?

  Choose Classic Thermal/Merino 250 for downhill skiing, cold-weather hikes, and multi-day use when insulation is the priority, and layer it under shells and midlayers. For high-output activities like trail running or aerobic touring pick Classic All-Season 150gsm or Intraknit for better breathability, quicker moisture transfer, and lighter packability.
• How do Smartwool women's baselayers fit, and should I size up—especially when considering plus sizes?

  Smartwool baselayers are designed with a slim, snug "second-skin" fit to optimize wicking and layering; most shoppers find them true to size but some prefer sizing up one for a looser fit. Size ranges include XS–4X for Classic lines (Women's Plus available 1X–4X) and S–XXL for Intraknit, with plus styles updated for wider body shapes.
• What construction and material features help prevent chafing and control odor in Smartwool baselayers?

  Flatlock seams and Merrow stretch stitching reduce chafing and improve mobility, while raglan shoulder panels minimize pack friction. Merino wool's fine fibers provide natural moisture-wicking, temperature regulation, and odor resistance, and Classic All-Season adds a nylon core for durability.
• How should I care for Smartwool merino baselayers to maintain fit and performance?

  Wash on a gentle cycle in cold water with a wool-specific detergent, avoid bleach and fabric softeners, and reshape and dry flat or tumble on low to preserve loft and fit. Airing pieces between uses leverages merino's odor resistance and reduces the need for frequent washing.