QIN Y Yes it is

LIKE H No. It won't. It will zip into Mountain light shell or triclimate, but NOT insulated.

JOHN F Frankly, I'm disappointed with the Northface product. I've purchased Northface in the past and was very happy. This jacket has a cheaper zipper, is not warm at all and I have to wear sweaters under it.. (I'm in Pittsburgh) the Hood comes down over my eyes so I can't see. For the money I would not buy this jacket again.

BEN B This jacket does not have any secondary zippers that allow anything to be zipped in. The jacket does allow for enough room to wear a fleece vest, while still maintaining a proper fit.

Zack W This is not zip-in compatible. It already includes (100g) PrimaLoft Eco insulation.

Zack W This is the only Mountain Light we sell from The North Face; this does offer insulation vs the regular Mountain Light does not offer insulation; please follow the l link below to see the manufacturer's web page for the Mountain Light; http://www.thenorthface.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=AUES&storeId=207&langId=-1&catalogId=10201 Enjoy it! Zack.

Zack W Please follow the link below to see one of The North Face Triclimate jackets: http://www.sunnysports.com/Prod/NFCHTJM.html#!1 Enjoy it! Zack.