Down - Down is the lightest and warmest option when it comes to outerwear insulation, the only drawbacks with down is it doesn't perform well in wet conditions and it's more expensive. Synthetics will dry faster than down and are easier to clean, but can't beat down when it comes to performing in very cold and dry weather.
A fill power rating measures the number of cubic inches that one ounce of that particular down will occupy, so a jacket with a 800 fill power rating will be warmer than a jacket with a fill power rating of 500.
Regular Fit - Oakley's regular fit jacket takes inspiration from the street — a bit longer, a bit leaner, but still ensures you have enough room in the places that matter most for movement.
DWR Coating - A durable water resistant finish applied to the exterior of the garment.