Thieves stole sportswear from two lorries parked on Normanton Industrial Estate.
Officers from the Normanton and Featherstone neighbourhood police team were called to the site this morning (Monday).
Police said that the thieves had broken into a warehouse compound before taking the boxes of sportswear from the articulated lorry trailers.
The theft took place sometime between Friday, July 4 and Monday morning.
Anyone with any information should contact PC Hewitt on 101 quoting Ref *265272.