Signature Line is a real DGA plastic, not a stamp series. It’s a rubbery, soft premium blend with strong plastic memory, so it flexes and returns rather than creasing.
Soft premium plastics are made for weather. Signature Line stays flexible when other plastics go hard, and it’s grippy in the wet. Three DGA moulds are listed in it, mostly putters.
In heat it gets gummy, and it isn’t built for driver speeds. It’s a feel plastic for the short game.