FabricBuilt-in warmth, without the weight.INVISTA's THERMOLITE® fabric and insulation provides warmth and comfort without weight, even when wet. Because it is comfortable and lightweight, THERMOLITE® fabric and insulation allows freedom of movement—making it the perfect layer. Its hollow-core fibers trap in air for greater insulation for light, yet heavy-duty performance. In a coat made with THERMOLITE® fabric and insulation, you will stay warm and dry. Its larger surface area allows for fast evaporation by sending moisture away from the skin to the surface of the fabric, where it quickly evaporates.
Hollow yarn has a hollow core created with a special spinning method. This is lighter and softer than regular cotton yarn, with excellent absorption and quick-drying properties. Because there is lots of air captured inside the yarn, it also retains heat well.
Micro fleece Polar Fleece
Fleece is a soft, lightweight, warm and comfortable fabric. It is hydrophobic, holding less than 1% of its weight in water, it retains much of its insulating powers even when wet, and it is highly breathable. These qualities make it useful for making clothing intended to be used during strenuous physical activity; perspiration is able to readily pass through the fabric. It is machine washable and dries quickly. It is a good alternative to wool (of particular importance to those who are allergic or sensitive to wool). It can also be made out of recycled PET bottles, or even recycled fleece.
There are disadvantages to this fabric as well. If not treated with a flame retardant, fleece is quite flammable, in contrast to wool, which is relatively nonflammable.] Non-recycled fleece is made from non-renewable petroleum derivatives. Regular fleece is not windproof and does not absorb moisture (although this is often seen as a benefit, per above). Fleece also tends to generate a high amount of static electricity, which causes the accumulation of lint, dust, and pet hair. It is also susceptible to damage from high temperature washing, tumble drying or ironing. Lower-quality fleece material is also prone to pilling.