MORGEN SKY's 5mm neoprene two-piece wetsuit with excellent cold protection. - Thickness: 5mm (fleece lining) - Material: Neoprene - Features: Stretch, insulation, cold protection - Set includes: 2-piece set I was looking for a 5mm jersey material with fleece lining, as it's quite rare, but it was too stiff and difficult for me to put on. I found it a bit inconvenient for quick changes at work, so I'm putting it up for sale. I think the insulation is excellent. I am 170cm tall and weigh 56kg, and I purchased a size S. I only tried it on once and haven't used it in water. Please feel free to ask any questions you may have. Thank you for looking.