Joel Kinnaman's 'RoboCop' costume was a ''challenge to put on''.

The 34-year-old actor plays cop Alex Murphy who is turned into a cyborg law enforcement officer in the movie and claims his iconic black costume was ''uncomfortable'' and he dreaded the thought of wearing it.

During a press conference, Kinnaman said: ''It was a little bit of a challenge to put on the suit. The first time I put it on, we were out in Pasadena and it was a hot day in LA. It took one hour and 45 minutes to put it on, and it was so uncomfortable. It was digging in everywhere. It was pressing down on my shoulders. I was just sweating like a pig. After 20 minutes, I said, 'I've gotta get out of this!' And then, I was thinking to myself that it was a daunting idea that I was going to have to wear this for 14 hours a day, six days a week for five months.''

Kinnaman felt ''vulnerable'' in his costume and insists this helped him relate to his alter-ego in José Padilha's remake of the 1987 film of the same name.

He added: ''The suit became one of the first seeds that led my imagination into the vulnerability that Alex Murphy felt, after he became RoboCop.

''It was an interesting contrast because he's got this body that is so powerful, but he feels very uncomfortable. He's amputated from his throat down. He doesn't know who he is anymore. And my little level of comfortability led me to think about what Alex would have felt, times a thousand. I was surprised to realise that the suit, which should make me feel so powerful, actually made me feel vulnerable.''