For the kid that needs a heavier weight baselayer, or as a layering piece for increased flexibility in your child’s winter wardrobe, the Ecolator 3.0 Top by Terramar is an expedition weight fleece designed to provide extra protection when it’s needed, vent and breathe when it isn’t. With an interior grid in a big soft waffle weave, the Ecolator traps warm air next to the skin in cozy comfort. But don’t let that fool you, this piece features ClimaSense® Thermoregulation Technology, a proprietary fabric technology by Terramar which is designed to maintain a comfortable environment by reacting to skin temperature. Cold? The fiber structure reacts by contracting, to trap air and create heat. Overheating? The fiber structure expands, venting heat and moisture. This piece is designed to work as a baselayer, or in combination with the Thermolator® top for added flexibility when you need to keep your child comfortable during winter activities. Functional thumbholes hold the sleeves firmly in place during activity, rolled forward shoulder seams and flat seam construction, make movement fluid without chaffing or excess bulk under the jacket. Terramar rates this as their warmest baselayer and expects it to be worn year around, as both a baselayer for winter, and as a stand alone sweater the rest of the year.