Girls' Athletic Base Layers

Check the brand-specific size chart and measure chest, waist, and hip; when in doubt, size for the child's current measurements rather than age, and allow room for a snug but comfortable fit since base layers are meant to be close to the body

Look for synthetic blends like polyester or nylon with elastane for moisture-wicking and stretch, or merino wool for natural temperature regulation and odor resistance; avoid 100% cotton if you need quick drying and active performance

Follow the garment's care label, generally wash in cold water on a gentle cycle, use mild detergent, avoid fabric softeners and bleach, and air-dry or tumble dry low to preserve elasticity and moisture-wicking treatment

For high-intensity activities choose lightweight, breathable, moisture-wicking layers; for cold-weather use opt for midweight or thermal base layers with insulating fabrics and flat seams for comfort under outerwear

Prioritize flat or covered seams to reduce chafing, tagless labels for comfort, UPF ratings for sun protection when outdoors, and reflective details if activities include low-light conditions

Prices vary by material and brand, with budget options often under $30 and higher-end or specialty merino and technical pieces averaging higher; the category average price is around the low-to-mid tens of dollars to mid-range depending on features

Yes — choose a slim, close-to-body fit that moves with the child without bulk; lightweight or midweight options work well under pants and jackets, while heavier thermal layers are best reserved for cold conditions