Marmot membrane ideal for walking and light hiking. It is worn in winter always with fleece inside. The zippers under the armpits are ideal as they act as extra ventilation during intense sweating. Extremely expensive though for what it offers. It is not waterproof in any case as in moderate rain the water seeps in first at the shoulders and then at the chest and back. Regarding the fit, with a chest of 110cm and 82 kg, the Large is the right size. If you find it close to 100 euros, you can consider it a bargain. Update: The cord (at the base) that tightens the hood has already come off from the membrane. I do not recommend it in any case.