Hi, I am planning to purchase very soon a Spyder jacket from your store but I have questions regarding the insulation technology.
I am looking at two Spyder insulated jackets with different insulation technology but I am little with the different insulation technology. Both jackets have similar features, mostly on the insulation technology but have a $200 price difference.

The Jackets:
Spyder Leader 2011:
http://www.backcountry.com/spyder-leader-jacket-mens
Spyder Bromont 2011
http://www.backcountry.com/spyder-bromont-jacket-mens

The Spyder Leader use Thinsulate Insulation (100g) and ThermaWeb™ Insulation, 80 gram
The Spyder Bromont use PrimaLoft Sport (60g)

My understand is 100g will be warmer than 60g when comparing same material technology but not sure when comparing Thinsulate (100g) with PrimaLoft (60g).

Can you help to understand the difference? Is PrimaLoft (60g) worth the extra money?
Thanks for any advices
Stephane

Hi Ed, very helpfull, thanks a lot. On a side note, according to the Spyder site the Leader jacket (http://www.spyder.com/All-Mountain-Mens-Quest/LEADER-JACKET-3204.html) also have the 360° Stretch except that it's using Stretch Nylon Dobby and Micro Polyester Taffeta Lining instead of Stretch Polyester and Stretch Polyester Woven. Stephane

Stephane, The main difference between the insulation packages on these jackets is not really a material weight issue, but how efficient each product is. The PrimaLoft does not need as much material weight, because it is a more efficient at insulating then Thinsulate. Other properties that makes PrimaLoft better is that it is more water resistant and more compressible, so your jacket can be packed down into a smaller area then a jacket with Thinsulate. The main reasons for the price difference are the fabric stories on these two jackets. The Leader Jacket uses a two way stretch fabric that has a lower breathability rating then the Bromont Jacket, due in part to the Thinsulate as well. The Bromont Jacket is made of a 360 degree stretchable fabric, that combined with the added breathablity of PrimaLoft creates a lighter product that keeps you warm and dry. The bottom line on these jackets is your amount of use. If you are going to be using this jacket to ski a lot, I would go with the Bromont because you will notice the stretch and breathability more during these types of aerobic activities. If you are only going to use the jacket for intermittent outdoor activity (i.e. a few ski days a year, and just walking around town) I would save some money and go with the Leader Jacket. Hope this helps!