The chainmail coif appeared at least as early as the 11th century AD. People wore chainmail coifs either on their own or beneath a helmet. Many depictions, such as those in the Morgan Bible from 1250, show the chainmail coif fitting closely around the head. Leather laces were sometimes used at the top to improve the fit, while additional laces could fasten the lower edge of the coif to the gambeson or hauberk, keeping the coif securely in place. For extra comfort, a textile cap or arming cap could be worn underneath the coif.
This chainmail coif is made of 1.6 mm thick butted round rings with an inner diameter of 9 mm. Each butted ring interlocks with four other rings in a 4-1 design. The coif covers the head, neck and shoulders.
| Size | Length (cm) | Chest circumference | Waist circumference | Shoulder width | Head circumference | Sleeve length | Hip circumference |
| XS | 145 | 79 | 66 | 33 | 54 | 49 | 80 |
| S | 160 | 88 | 69 | 36 | 56 | 53 | 92 |
| M | 175 | 98 | 78 | 40 | 58 | 56 | 102 |
| L | 180 | 108 | 89 | 45 | 60 | 59 | 112 |
| XL | 187 | 120 | 102 | 50 | 62 | 62 | 125 |
| XXL | 194 | 139 | 118 | 55 | 64 | 63 | 144 |
| XXXL | 200 | 152 | 132 | 60 | 63 | 158 |
