Quick answer
Nike offers a Canadian storefront. Select Canada and check the options for your basket. The US site excludes international shipping, reshippers and freight forwarding services.
Use the Canadian storefront
Check the selected country, currency, address and final total before paying. A Canadian storefront alone does not establish that the parcel leaves a Canadian warehouse.
US-only products
Forwarding should not be presented as an approved method: the US terms exclude it. Ask Nike which permitted options are available for the product you want.
Delivery and returns
Keep the order confirmation. For a delivery problem or return, use the instructions from the storefront that sold the item and check the permitted origin of any return label.