Find a SEAC size chart online and see where you measure up. The reviews are full of people who either have no idea what an open cell wet-suit is, or are in denial of their body proportions. 5'11" with 31" waste and 32" inseam and weigh 165lbs. I was worried the mediums would be too short so I got the large. The large pants fit decent, but has loose baggy areas around crotch and upper thigh. Ordered the mediums and will have to see how they fit.As usual seac sub products came off small compare to other brandsGreat product, very comfortable. Definitely order a little larger than you might expect but be aware these are supposed to fit tight anyway. I'm 6' and 165 lbs and the large fits great. (I usually use an XL Kobra jacket).Got the 5mm but its a tad too tight.Bought large so fit was fine-advice for other buyersThis is no way XXXL. My XL RIffe pants are 4! inch longer from my crouch to the feet!Ich habe diese Neoprenhose in 5 mm kurz vorm Urlaub bestellt. Leider ist mir erst im Urlaub aufgefallen das ich das 3 mm Modell erhalten habe.