Once your heart rate gets pumping, sweat can be a swampy issue even for modern weather shells. With the exception of Thorne Bay. The 3-layer fabric is lightweight and seam-sealed, able to lock out a downpour. Made with a Pertex® waterproof barrier – the most breathable we’ve offered, with a 25,000g/m2 MVT rating. Translation? It’ll vent sweat vapor to keep you comfortable in most anything short of time trials. And when you’re headed into wilder parts and space becomes a consideration, the jacket zips down into its own pocket for pack-in portability.

• Made with a Pertex® barrier for top-of-the-line waterproof/breathable performance 
• 10K waterproofing plus fully sealed seams to lock out a rainstorm 
• Exceptional 25K breathability vents sweat vapor – stays comfortable when you're moving at a fast clip
• 3-layer fabric allows better airflow and prevents the clammy, clinging feeling of normal rain gear
• Front- and back-adjustable visored hood with reflective trim
• Packs down and zips away in the jacket’s own chest pocket
• 2-way zipper with storm flap plus a cinchable hem to block out wind blasts
• Drop tail keeps rain off your rear
• Closer-to-the-body fit to keep you comfortable and bind-free during high activity
• Imported