How much does the size matter? Is the bit...
How much does the size matter? Is the bit with the air vents a different size or just the straps? I'm smallish but am wondering whether I can wear a M/L Ok (I'll just cut off the excess straps) or will it result in the "in" air vent being on my back next to the "out" vent and as a result not work so well. I'm not in the US and now BD has got very strict about Int shipping my options are restricted. Thanks
You should be ok with a M/L. Just make sure that you place it in the correct manner on your body and that you do not restrict airflow in the crucial parts