Fleece is an excellent fabric choice when selecting onesie pajamas; however, not just any fleece will make great sleepwear. Big Feet Pajama fleece footed pajamas are made using premium100% polyester micro polar fleece. Micropolar fleece provides the soft warm comfy cozy qualities of polar fleece with less weight and better moisture-wicking properties, making it perfect for sleepwear. Our fleece is a premium micro polar anti-pill fleece. Anti-pill fleece is a higher quality, more expensive fleece, that is more durable and resists pilling. Anti-pill fleece will not ball up (pill) or pull apart as non-anti-pill fleece will during wear or most noticeably during or after wash and dry cycles. Big Feet Pajama Co. micro polar anti-pill fleece pajamas are available in a variety of colors and prints for the entire family, and a few fleece hoodies for pets, making them the perfect choice for memorable family pictures. Premium Micro Polar Anti-Pill Fleece Soft Comfortable Cotton Rib Knit Collar and Cuffs Footed Onesie with Breathable No-Slip Non-Skid Soles Matching Family Pajamas Youth & Adults Lower Heating Costs wearing Warm Micro Polar Fleece Onesies Easy Care - Machine Wash & Tumble Dry - Will not Shrink, Fade or Pill