Hi there, im interested in purchaseing the "black crow" Red Trace helmet. But i cant seem to get into the sizeing chart. Ive measured my head and is a little over 23 inches in circumference ,i think i may be a large size but not to sure. Could you help me out with the sizing. Also what is the cost to ship to Jasper ,Alberta Canada and approximate shipping time. Thankyou , hope to hear back soon as to proceed with purchasing. One more question do you have "session,Boner" snowboarding pants in a large , if so how much?