Even though "baskets" refers to a pair of shoes, in French, it is considered a masculine noun. You would say:
* Des baskets (masculine plural) - "sneakers"
* Une basket (feminine singular) - "a sneaker"
However, it's important to note that the adjective used to describe the sneakers will need to agree in gender with "baskets".
For example:
* Des baskets rouges - "red sneakers" (red is masculine)
* Des baskets jaunes - "yellow sneakers" (yellow is masculine)
* Des baskets bleues - "blue sneakers" (blue is feminine)