Victorian police officers have called for new pants after reporting their current uniforms are splitting at the crotch when they are trying to arrest people.

Police Association Victoria secretary Wayne Gatt said members had reported poor-quality and ill-fitting pants.

"The material used in manufacturing the pants is particularly unpopular with members, who have advised that the material does not breathe, and that the pants cause excessive sweating particularly in summer," he said.

Mr Gatt said some officers had complained the excessive sweating had caused them medical problems.

He said the trousers limited police movements when they were trying to make arrests.

"Our members tell us that the cut of the pants limit their movement when they are required to execute some of the defensive techniques they are trained to perform, and are particularly limiting when they are required to complete routine policing tasks, such as jumping fences," he said.

"Many have reported that the pants split at the crotch easily, and are particularly prone to do so when executing a common arrest technique."

Mr Gatt said he hoped the officers' concerns were addressed as soon as possible.

Victoria Police said it was aware of problems with police-issued trousers in "a small number of cases" and in response the crotch seam had been strengthened.

"The Victoria Police-issued uniform has undergone significant testing to ensure that it keeps employees safe," a police spokeswoman said.

"Therefore all police are required to wear the full uniform unless they have obtained a specific exemption."

Victoria Police said there had not been any recent changes to the design of the pants, but a trial to update the women's uniform size range was planned.

"The comfort and safety of our employees is paramount and we are working closely with TPAV [The Police Association Victoria] to ensure this is not compromised."