A personal protection suit has a selectively sealable hood (1) for protection against CBRN threats. In one series of embodiments, the hood (1) is separable from a jacket body (5) by a releasable attachment means (11), and has a mask hood seal (2) for sealing with a mask. In one series of embodiments the hood (1A) has a deployable face mask (60) stored within the hood (1A). The hood (1) can be removed without breaking the seal between the mask and mask hood seal (2) to minimise contamination during donning and doffing.