If you’ve ever wondered, “what size shoe was Robert Wadlow?”—the answer is a staggering size 37AA (U.S. size 37). For cross-border e-commerce sellers, that’s not just a trivia fact; it’s a doorway into the lucrative world of ultra-large footwear, custom sizing, and underserved niche markets. Robert Pershing Wadlow, the tallest person in recorded history at 8’11”, needed shoes that were custom-made to support his extraordinary frame. Today, thousands of customers around the world with similarly extreme sizing needs struggle to find products that fit—and they’re willing to pay a premium for solutions.

In this article, we’ll explore the practical implications of Wadlow’s shoe size for your online store. You’ll learn how to identify high-demand niches, optimize product listings for long-tail keywords, source custom manufacturing, and turn extreme sizing into a profitable competitive advantage. Whether you sell on Shopify, Amazon, or eBay, these insights will help you scale.

Why Robert Wadlow’s Shoe Size Matters for E-Commerce

The question “what size shoe was Robert Wadlow” isn’t just historical curiosity—it’s a case study in market gaps. Wadlow’s size 37AA shoes were custom-built by the International Shoe Company, a brand that recognized the value of addressing outliers. For modern sellers, this represents a blue ocean strategy: instead of competing in crowded size 8–10 markets, you can dominate extreme sizing. Here’s why:

  • Low competition, high demand: Keywords like “extra wide shoes,” “size 18 shoes,” and “custom tall sneakers” have search volumes that dwarf product availability.
  • Premium pricing power: Customers with non-standard sizes are accustomed to paying 2–3x more for bespoke or specialty items.
  • Low return rates: When you solve a genuine fit problem, buyers are loyal and rarely return.

Imagine you’re an Amazon seller. A simple search for “size 37 shoes” returns only a handful of results, most of which are low-quality or out of stock. That’s your cue—the same cue that International Shoe Company followed in the 1930s when they produced Wadlow’s footwear.

How to Source and Sell Ultra-Large Shoes

Now that you understand the market opportunity, let’s get tactical. Selling shoes in Robert Wadlow’s size range (or any extreme size) requires a different approach than selling standard footwear. Here’s a step-by-step guide for cross-border sellers:

1. Identify Your Niche Within Extreme Sizing

Don’t try to cover every size. Focus on one pain point:

  • Men’s size 20+ shoes (athletic, dress, or casual)
  • Extra-wide widths (4E, 6E, or custom widths)
  • Tall women’s footwear (size 14–18 with narrow heels)

For example, if you target the “what size shoe was Robert Wadlow” audience, you might specialize in custom orthopedic shoes for very tall individuals (6’5” and above). Use Google Trends to compare search volume for “big shoes for tall men” vs. “wide shoes for women.”

2. Partner with Custom Manufacturers

Most off-the-shelf suppliers won’t produce size 37. Instead, look for:

  • Bespoke shoemakers in Portugal or Italy (known for high-end custom footwear)
  • Chinese factories specializing in large molds (use Alibaba filters for “custom size above 14”)
  • 3D-printing startups (for one-off production runs)

Pro tip: Ask for a sample in the largest size they can make. If it’s not size 37, negotiate a custom mold—it’s a one-time investment that can pay off within 20 sales.

3. Optimize Product Listings for Long-Tail Keywords

Beyond the main keyword, integrate variations naturally:

  • “Robert Wadlow shoe size 37 replica sneakers”
  • “Custom footwear for 7-foot tall men”
  • “Ultra-large shoes size 36–40 for athletes”
  • “Wadlow-inspired orthopedic boots”

Example for an Amazon listing: Title: “Custom Men’s Dress Shoes Size 37AA – Inspired by Robert Wadlow’s Footwear – Handmade Italian Leather – Extra Wide Fit for Very Tall Men.” Bullet points should reference pain points like “No more squeezing into shoes that are too short” or “Designed for 250+ lbs frames.”

4. Create a Landing Page Focused on the Niche

On Shopify, build a dedicated collection called “The Wadlow Collection” or “Tall & Wide.” Include a blog post about “what size shoe was Robert Wadlow” to drive organic traffic. Use that content to:

  • Explain the sizing challenges (e.g., “Most brands stop at size 16 – we go to 37”).
  • Feature a size chart comparison (e.g., “Robert Wadlow’s foot measured 18.5 inches – here’s how to measure yours”).
  • Add customer testimonials from tall buyers.

Data-Backed Insights: The Economics of Extreme Sizing

Let’s look at some numbers to justify your investment in this niche:

  • Market size: The global big and tall men’s apparel market was valued at $12.8 billion in 2023, with footwear representing 18% (source: Statista).
  • Conversion rates: Niche stores with custom sizing see 4–6% conversion rates vs. industry average of 2–3% on standard shoes.
  • Customer LTV: Repeat purchaser rate for extreme sizing buyers is 70%+ higher because they have no alternatives.

For example, a Shopify store selling “size 18+ basketball shoes” reported 92% gross margins by using direct-to-consumer custom manufacturing at $55/unit and selling at $199. Compare that to a standard shoe store with 50% margins and high Amazon fees.

Actionable takeaway: Calculate your break-even point. If you can sell 100 pairs of custom size 37 shoes at $250 each (COGS=$80), that’s $17,000 profit. Compare that to selling 1,000 pairs of size 10 shoes at $60 each (COGS=$25, plus ads)—the profit is similar, but the custom niche requires less ad spend and fewer returns.

Marketing Strategies for Extreme Footwear Niches

To reach customers searching for “what size shoe was Robert Wadlow” or similar phrases, you need targeted campaigns:

1. Content-Driven SEO

Write pillar articles like:

  • “The Ultimate Guide to Shoe Sizes for Tall People” (include Wadlow’s size as anchor).
  • “Why Most Shoe Brands Fail Above Size 16 (And How We Fix It)”
  • “How to Measure Your Feet for Custom Shoes – The Wadlow Method”

Optimize for featured snippets by answering questions directly: “What size shoe was Robert Wadlow? He wore a U.S. size 37AA, which is approximately 18.5 inches long.”

2. Social Proof from Experts

Collaborate with tall influencers (e.g., basketball players, height activists on TikTok). Send them free pairs in their size and ask for honest reviews. Then recycle that UGC on your product pages.

3. Email Sequences for Niche Audiences

Segment your list by shoe size. For customers who bought size 20+, send:

  • “Need even bigger? We now offer size 25–37” (cross-sell).
  • “Robert Wadlow’s shoe story – why fit matters” (educational).
  • “Early