Perspirex Underarm Roll-on Anti-Perspirant 20ml Perspirex Underarm Roll-on Anti-Perspirant 20ml Perspirex Underarm Roll-on Anti-Perspirant is a high-performance antiperspirant designed to provide effective, long-lasting protection against excessive underarm perspiration and unwanted odour. Its clinically tested formula helps keep underarms dry and comfortable for several days following application. The convenient 20ml roll-on format allows for controlled and easy application. Perspirex is applied at night, when the sweat glands are less active, and washed off the following morning. Once effective sweat control has been achieved, fewer applications may be required to maintain protection.