Little Dragon: I've worn a few maille shirts in my time. About 25-30 pounds means it likely was little more than a byrnie - sort of a "sleeveless t-shirt" made of maille. A full Hauberk for a normal build man of average height, using 5/16" links of 16 guage wire (roughly the average historical proportions) would weigh closer to 40-50 lbs. And normally, the weight is distributed on the shoulders, across the front of the chest, and on the hips (especially if it's belted). So I, for example, can still do cartwheels and diving rolls in my chainmail byrnie -> 26 lbs of 14 guage wire with 1/4" links, considerably tighter links of thicker wire than historically average.

Remember, kids! Napalm is Nature's Toothpaste!