Please Note: All sizes listed are measured at the chest as HA Salopettes are a high-bib design. As this garment is made to order, we will contact you for additional sizing information to ensure a correct fit. Pertex 6 Shell with ' Aqua Therm' pile lining. These Salopettes are specifically designed for Mountaineering & High Altitude climbing. The specification is the same as the Standard Salopettes with the addition of high tensile patched bum, knee & lower inner leg to protect against damage from ice climbing. The patch fabric, developed by Buffalo, is very breathable, but in low level damp atmospheric conditions it does not allow moisture to evaporate as rapidly as the Pertex it is protecting. Consequently it is not suitable for low level conditions, but is ideal for less humid higher altitudes.