Here are some H1 templates that can help boost SEO for an e-commerce opencart website:

1. Product Name + Category: [Product Name] in [Category] Example: “Leather Jacket in Women’s Clothing”
2. Benefit-driven Headline: [Product Name] That [Benefit] Example: “Winter Coat That Keeps You Warm and Cozy”
3. Problem-solving Headline: [Problem] Solved by [Product Name] Example: “Say Goodbye to Dry Skin with Our Moisturizing Cream”
4. Unique Selling Proposition: [Product Name] That [USP] Example: “The Only Backpack You’ll Ever Need – Durable and Spacious”
5. Brand-centric Headline: [Brand Name] [Product Name] Example: “Nike Running Shoes for High Performance”

Remember to keep your H1 tags concise and relevant to the page content, and to include your target keywords for optimal SEO performance.