Armour, and in particular body armour, for protection against a projectile 20 said armour comprising an inner protective layer 12 and outer protective layer 10 with a gap 14 between them which contains a fluid such as air. The outer protective layer 10 is sufficiently rigid such that a projectile 20 passing through it causes a pressure wave 22 in said fluid, said pressure wave resulting in said projectile fragmenting 24 or tumbling prior to impacting said inner protective layer 12. Spacer members, having (semi) ellipsoidal or (semi) spheroidal profiles may also be positioned in the gap 14.
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