[SINN]

Level 5 is a step up from just wind breaking. Level 4 windshirts are designed for that. Level 5 PCU/MCU actually does breath but also allows a little more warmth. Combine the level 5 with level 3 thermals and you are actually super toasty!

Here is a quick breakdown:

Level-1,Silk Weight boxers, t-shirts, pants and long sleeve shirt
Level-2, Mid weight PowerDry,shirt and pants
Level-3, ThermalPro pullover
Level-4, Windshirt which is windproof.
Level-5, Softshell jacket and pants (wind proof and water resistant)
Level-6, Hardshell Polyurethane coated jacket and pants
Level-7, Insulated jacket pants and vest...but keeps you looking like mr. staypuff

This past weekend, i wore a level 5 PCU top with level 2 and 3 under. I was sweating when it was cold! I brought my level 6 rainjacket, but decided I didnt need it since it doesnt breath and we were running around. The water just beaded off of the PCU just fine.