Aspects herein provide for a method of manufacturing a vented insulated garment using non-woven polymer sheets and garments produced therefrom. The method generally comprises providing a non-woven polymer sheet having one or more voided portions, positioning the sheet between two textile layers, and bonding the textile layers together at areas corresponding to the voided portions in the non-woven polymer sheet to form a seam. The seam may be optionally perforated.