The Prio Stretch Fleece fabric gives the Contour an active fit with great warmth and freedom of movement. Offset and flatlocked shoulder seams reduce rub and chaffing points. The long zip is designed to allow you to vent and the thumb loops and elasticated cuff give a good fit.
Prio stretch fleece is very like PowerStretch - nice fleecy and warm internal face with smooth outer face. The Contour has a deep front zip and a high collar which can be fastened all the way up.
OMM likes thumb loops - again a very practical feature. Contour is an ideal winter base-layer.