This is a 23.5 x 32.75 neoprene mat (one-sided) comprised of battle maps from D-Day Dice (Second Edition) and 2 of its expansions, available exclusively through the 2017 Kickstarter campaign. This item combines 9 specific battle maps into one larger map intended for campaign play, for which the rules and scenarios are included in the Overlord Expansion. The mat has the same dimensions as combining the 9 battle maps individually would have, which is possible to do if desired as none of these 9 battle maps are printed on the back of any of the other 8.
The neoprene mat is comprised of 3 battle maps from the Atlantic Wall (Second Edition) Expansion (the entire left column), one from the Overlord Expansion (the bottom right corner), and the remaining 5 from the D-Day Dice (Second Edition) base game. Specifically, the battle maps, in order of top to bottom, left to right, are:
N21 Achtung Panzer! (Atlantik Wall Expansion)
N07 Chateau de Vaumicel
N09 Mare Fontaine Battery
N20 WN-68 (Atlantik Wall Expansion)
N06 Vierville Draw
N08 Mont Fluery Battery
N19 Dog Red
N02 Omaha Beach
N03B Gold Beach (Overlord Expansion)
Note that the only difference between battle map N03 (from the base game) and N03B is that N03 has a second bunker (with defense of 25, machine gun fire, and 5 courage requirement to enter), which is replaced by a crater on N03B.