This new yarn from DY Choice comes in 3 colour ways, one that is gradients of blues, one gradients of black/grey, and one rainbow/pink/purple.  There are 2 very nice men's patterns to go with it, a mock rib jumper and what looks like a fisherman's rib cardigan.  Of course, since it knits to standard DK tension, you can use whatever pattern you like!  It feels like a satisfyingly heavy ball, which being 300g  I guess it is!  A medium jumper only uses 2 balls.