Always use a pop shield between the singer and the microphone. Failure to do so will almost certainly result in unnatural ‘pops’ on plosive ‘b’ and ‘p’ sounds that can’t be fixed afterwards. The pop shield may be a commercial model or a DIY job comprising stocking material over a wire coat hanger frame or even a fine metal or plastic sieve or chip-pan splash guard. Any of these will do the job without affecting the tone of the mic. Foam wind shields are virtually useless in combating pops.
NOTE : foams cant do the work of a pop filter