The Lowe Alpine Dryflow 150 Zip Top has a high stand up collar to reduce drafts & a long zip to help with ventilation. You could even use this piece as a mid- layer over a lightweight base layer for strenuous activities in cold conditions. The 150 refers to the fabric weight of 150gsm. Highly effective moisture management works when you are active & sweating to spread the moisture over the large surface area to evaporate rapidly, & then when you stop the fabric dries very quickly to ensure efficient temperature control, reducing the chilling effect. Cocona fabric is made using natural technology & contains activated carbon from discarded coconut shells. Cocona will not wear off or wash out as it is contained inside the fibres. It is extremely breathable & accelerates evaporation by increasing the surface area by 800%. The activated carbon element absorbs odour molecules which are then released & the carbon refreshed by the warmth from washing & drying. As well as all that it provides a natural UVA & UVB barrier & shields the skin from harmful UV radiation. To really help you remain pong free Lowe Alpine have also added Microban to the garment which inhibits bacterial growth to keep the Dryflow 150 Zip Top smelling fresh. Microban is built in during the manufacturing process providing odour control for the lifetime of the garment