Neoair was the lightest mat for a while there but exped have beaten them this year.
MSR NeoAir Trekker™ torso weight 450g R value 2 - 119cm x 63cm thickness 6.3cm
Exped SynMat UL 7 Small weight 430g R value 3.1 - 163cm x 52cm thickness 7cm
Exped sounds like the clear winner if you want the lightest mat possible. Neo air is a inflatable mat with a reflective layer on one side to retain heat. Synmat is a inflatable mat with synthetic insulation inside. In theory the insulation is laminated to the top and bottom of the mat for maximum loft.
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