This is a new style tam I've just come up with that has a more rounded shape and is knitted in a crisscross cable stitch.  The bobble at the back is crocheted.  The hat is all wool and the multi-color body of the hat is two ply, so it's nice and thick.  The brown is Romney wool, and the colors are mostly Merino wool.  This hat will fit up to an extra large and is very roomy inside with a nicely fitted curled brim.