Buying a Valentine's Day gift for a boxer can be a unique and thoughtful way to show your love and support for their passion. A good starting point could be boxing gear or equipment that will help them improve their performance in the ring. For example, a new pair of boxing gloves, hand wraps, or even a new skipping rope can be a great option. You could also consider purchasing a personalised boxing robe or boxing ring shorts with their name on it. Whatever you choose, make sure it's something that they'll appreciate and help them in their boxing journey.