Are they long on the finger ?, short, tight across the knuckles or comparable to other glove sizes from other manufacturers ?
In the sealskinz outlet theres some good bargains, and i really could do with an insulated and waterproof glove. But as ever, picking the right size saves the faff on returns etc.
At Xmas I got my nephew a pair of standard gloves, which were a medium, and while they fitted on me, those were tight and so a large would be more my size. But my other winter waterproof glove(no longer waterproof) made by BBB are sized XL which fit comfortably, especially as I have longer fingers so then should I get XL which i guess will fit. So its kind of down to that - Large will fit, but might be too short, but XL will also fit but might be 'baggy'
I've found them a pretty close match in size to Specialized gloves, if that helps.
Different models* size up a little differently.
*edit, would the word be "styles" here? Designs?
I found the All Weather MTB ones in the otherwise correct size to be tight across the knuckles, where the armour strip is, when you moderately curl your hand. Basic thing to get wrong for a bike glove really!
I wear a medium endura glove (bob on fit for me) and find I'm a medium in sealskinz as well. I have sealskinz harling and just got the Sutton MTB gloves. They're bang on and don't find the issue mentioned above.
I have medium briskers as well, they're a little baggy!
