12 PACK BASE LAYER / UNDERSHIRT/ OUTERSHIRT LONG SLEEVE TOPS ; Natural Breathing Soft Cotton Fabric with a Touch of Flexible Spandex in Brilliant Colors Snug Fitting but extremely Flexible & Soft ; Smooth Cotton Slim Fitting w Stretch / Great Under Clothing Layer No Thick Bulge Heavy Underwear Provides Extra Warmth In Cold Weather & Great Wear Alone in Mild Temps Smooth & Soft Flat Knit Jersey Fabric for Great Fit & Comfort : Long Sleeve Crew w Spandex Rib Wrist Stay in Place Cuffs Openings / Tag Free True to Size Amazon Size Chart ; Available in Sizes Toddler to 16 - Unisex Easy Care ; Machine Wash Cold / Lay Flat or Tumble Dry Fit type: Athletic Fit This 12 Piece Long Sleeve Shirt Saver Pack from Snoozzz'n includes 12 Long Sleeve Base Layer Underwear / Shirts in Fun Assorted Colors . Fabric is a Premium Cotton Spandex Blend allowing the body to breathe naturally as the layer under clothing.