Scent-lok clothing is not designed for warmth. Its designed to adsorb odor. If you need warmth, the standard hunter recipe I use is:
Base layer next to skin that wicks away moisture,
Thermal long johns,
Micro fleece shirt and/or pants depending on temps,
Wool shirt/pants if extremely cold,
Oversize scent-lok shirt/pants to wear over all other clothes.
Remember that most of your body heat is lost through your head, hands and feet. If you wear wool hats, gloves and thermal socks you will be surprised how warm you will be.
The really important thing to remember is that after it turns cold, cotton has no place in your hunting clothing mix. Its ok when its warm or just cool out, but if you want to be warm in the cold weather skip the cotton.