The European size designation 41 is just metric for what we would label 16 (41 cm. = 16.14"). Â This is the NECK size and tells you absolutely nothing about the sleeve length. Â You need to have that information to make an informed purchase. Â Size 41's can have sleeve lengths anywhere from about 32" to 37". Sometimes the sleeve length is given exactly, as, say, 34. Â More often it will be given in 2" increments, as, for example, 32/33, 34/35, 36/37 (these are the pairings that are used). Â In my experience, most 34/35s run about 35", and I have bought some that have gone to 36". Â When buying online--as, for example, from eBay--you really need to ask the seller the question about sleeve length, and ask that person to actually measure the sleeve length (correctly: starting from the middle of the back, just under the collar, proceeding across the shoulder to the shoulder/sleeve seam, and then down the sleeve to the end of the cuff). Â Once you know what your correct measurement is, you can ensure that, before buying a shirt this way, you are satisfied that it has this sleeve length. Â I wouldn't trust the listing giving "34/35", for example, to Â guarantee a sleeve length of 35". Â Ask the seller to measure.