All Purpose / All Season Tops : Base Layer Long Sleeve Natural Cotton Soft Tops Natural Breathing Soft Cotton Fabric with a Touch of Flexible Spandex in Brilliant Colors Snug Fitting Yet Extremely Flexible Stretchable - Smooth Cotton Slim Fitting No Bulk with Stretch / Great Under Clothing Layer No Thick Bulge Heavy Underwear Provides Extra Warmth In Cold Weather & Great Wear Alone in Mild Temps. Great for Outdoor and camping. Spandex Rib Wrist Stay in Place Cuffs Openings | Tag Free Comfort True to USA Boys- Girls Sizes - Available in Sizes Toddler to 18 - Unisex Easy Care Machine Wash Dry | Value Multi Packs Mean Less Laundry Trip This 6 Piece Long Sleeve Shirt Saver Pack from Andrew Scott includes 6 Long Sleeve Base Layer Underwear / Shirts in Bold & Basic Colors . Fabric is Premium Cotton Spandex Blend allowing the body to breathe naturally as the layer under clothing.