Niagara Performance Knitwear specializes in high quality, durable, Canadian Made sweaters for the retail, uniform, school and corporate image markets. We have been providing customers with these remarkable sweaters for over 100 years.

Previously Niagara Performance Knitwear (NPK) was known as Warren Knit. Our new name continues to bring high quality goods and services to our customers.

NPK is Canada's largest manufacturer of Pil-Free sweaters. This high tech fiber means virtually no pilling or balling of our sweaters. This unique Pil-Free attributes of Pil-Trol sweaters means these sweaters will keep there fresh new look!