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If you want a warm layer with the option for temperature control, look no further than the Smartwool NTS Midweight 250 Zip Top. In the unlikely circumstance that the Merino wool of this top can't regulate your skin temp, just unzip for an instant cooling effect. Not that you'll even need to do that, since the Smartwool NTS Midweight 250 Zip Top is a moisture wicking machine, designed to regulate your body temperature. This thing works wonders as a base layer, and has flat seams constructed for ultimate comfort, so you don't have to worry about chafing under all that gear.
100% Merino wool
Interlock knit; UPF 50+
Fabric Weight – 250 gm / m² (7.4 oz / yd²)
Form fit
8" (20cm) Center front zip with semi-locking logo slider
Back body seam wraps to front for body enhancing fit
Shoulder Panels Eliminate Top Shoulder Seams
Flatlock seam construction eliminates chafing
Heat Transfer Logo at Left Sleeve Cuff