Cold Fusion Carbon(TM) Adsorbs odors S3A(R) anti-microbial finish Prevents odors Smooth polyester face fabric Great for layering Microfleece inner lining For warmth Raglan sleeves For mobility in the field Flatlock seams For comfort The Underguard Base top delivers a one-two punch that provides whitetail hunters elite scent control and comfort, but there's always room for improvement. This new system features an improved fabric with a smooth polyester outer backed with a warm microfleece lining for added warmth. Lastly, we bonded our Cold Fusion Carbon(TM) technology between these layers to adsorb odors right at the core, helping you beat the nose of whitetails.