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In page Boiled leather:

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Cuir bouilli was used for cheap and light armour, although it was much less effective than plate armour, which was extremely expensive and too heavy for much to be worn by infantry (as opposed to knights fighting on horseback)[citation needed]. However, cuir bouilli could be reinforced against slashing blows by the addition of metal bands or strips, especially in helmets. Modern experiments on simple cuir bouilli have shown that it can reduce the depth of an arrow wound considerably, especially if coated with a crushed mineral facing mixed with glue, as one medieval Arab author recommended.[1]