A mail byrnie was a corselet or vest of mail, covering the torso, abdomen, shoulders, and sometimes a small part of the upper arms. Mail Byrnies in antiquity often featured a second layer protecting the shoulders in the form of a mail collar or shoulder piece. Mail isn’t really effective without some kind of padding worn underneath so it’s assumed that mail here will be worn with a light coat armor or aketon. For more information see the entry on Mail in the Armor Glossary, and also see Mail Habergeon and Mail Hauberk).

Name	DR Pierce	DR Cut	DR Slash	Weight	Bypass	Hardness	HP
Mail shirt (byrnie)	8	16	24	10	3.0	6	5