The pockets of the NX250 DO NOT have overlapping baffles, so I experienced rather severe cold spots at the edges of each pad and especially at the center corner intersections of the Z-Liner pads. Plus the pads don't hold their shape within the pockets, so they collapse away from the baffles, leaving even bigger cold spots.
I returned my Z-Liner for a full refund. At the time I did suggest that they construct the pockets so that the edges of the pads could overlap.
The pockets and pads are a great idea, but they are (or weren't a few months ago) constructed for maximum efficiency.