The Daylight Plus has improved durability over the usual lightweight day bags.  As well as the extensive Roam Daylight features: 5mm high density padding throughout, heat reflective material outside and wax resistant material inside, generous padded carry handle with a buckle free strap, longer zip and tail darts, the Plus model has a tough 600D nylon side to resist the wear and tear of daily use. 

Roam bags are cut longer so a bag will fit the board that is labelled for (a 6'8" bag will fit any size up to and including 6'8").  The cut is slightly wider in the tail so you can chuck in a wetsuit or put your board in a board sock for extra protection.