Used by commercial, Police and Military divers, approved by NATO, Xerotech gloves ensure safe, warm, dry hands, on or in the water. Ask any of the Whitbread racing teams,or the Coast Guard. Sizing: British and European size number marks, represent the circumference of the hand, measured just under the knuckle line, in inches. With a normally shaped hand, the extended span, from tip of the little finger, to the tip of the thumb, the measurement coincides roughly with the palm circumference and when measuring for our gloves, the span in the better measure for a good fit. Xerotech Gloves: Minimum Performance Testing EN 420 for general requirements EN 388 for mechanical risks EN 374-2 for tightness EN 511 for extreme cold