Inventory management for Shopify sunglasses brands

The inventory problems sunglasses brands run into

• Variant explosion. One frame style can come in six colors and two lens options (polarized, non-polarized), so a single design turns into a dozen SKUs you need to track separately.
• Fast-moving trends vs slow classics. Aviators and wayfarers sell steadily year-round, but trend colors or collab releases can spike hard for a few months then stall, and you need different reorder logic for each.
• Fragile and seasonal accessories. Cases, cleaning cloths, and straps sell alongside frames but get forgotten in reorder planning, leading to stockouts on cheap add-ons that still hurt average order value.
• Overseas manufacturing lead times. Many sunglasses brands source frames from factories abroad, so a late shipment during peak season can mean missing the entire summer selling window.
• Limited edition drops. Collab or limited runs need a different approach than core styles, since you don't want to reorder a one-off print but you also don't want to undersell it.

Seasonality and demand

Demand for sunglasses peaks hard in spring and summer, with a smaller bump around holiday gifting and travel season in December. Polarized and sport styles tend to spike earlier as people plan vacations, while fashion styles sell closer to warm weather itself. Many brands see a long quiet stretch from late fall through winter outside of gift-buying. Plan your biggest restocks for late winter and early spring so stock lands before the rush, and treat any post-summer leftover styles as candidates for clearance rather than reorder.

Suppliers, lead times and minimums

Most sunglasses brands work with one of two supplier types: overseas frame manufacturers (often in Asia) for custom or branded designs, and domestic distributors or private label suppliers for faster turnaround on stock designs. Overseas manufacturers often take several weeks to produce and ship, especially around their own peak seasons, and usually require MOQs per color or per style rather than per order. Domestic suppliers tend to have shorter lead times and lower minimums but higher per-unit cost. Case packs are common for accessories like cases and cloths, often bundled in sets of 12 or 24.

Worked example

Say your store sells a polarized aviator in tortoise shell, averaging 4 units a day in peak season. Your overseas supplier has a lead time of 30 days, and you want 10 days of safety stock, so your reorder point is 4 x (30 + 10) = 160 units. If you want 45 days of total cover and you currently have 90 units on hand with 50 already on order, your order quantity is 4 x (30 + 45) - (90 + 50) = 300 - 140 = 160 units. If the supplier's case pack is 24, you'd round up to 168 units to place a clean order.

Try it with your own numbers in the reorder point calculator, or size your buffer with the safety stock calculator.

A simple system to start this week

1. List every frame and lens combination as its own tracked variant, not just the parent style.
2. Set separate lead times for overseas manufacturers and domestic suppliers in your system.
3. Build in extra safety days for your peak season (spring/summer) and shorten them for the off season.
4. Flag limited edition or collab runs as one-time buys instead of ongoing reorder items.
5. Review accessory SKUs (cases, cloths, straps) during each reorder cycle, not just frames.
6. Place core style reorders early enough to land before peak season, accounting for the longest lead time in your supply chain.

How SteadyShelf fits sunglasses brands

SteadyShelf tracks each frame-color-lens combination as its own variant, forecasts demand with your seasonal pattern in mind, and tells you when to order from each supplier based on their lead time, rounding to their case pack or MOQ. It will draft and send the purchase order and receive stock as it arrives, including partial shipments from split production runs. It doesn't handle multi-location transfers or landed cost calculations, so if you stock warehouses in multiple regions or need to factor duty and freight into unit cost, you'll need to manage that separately.

$29/month flat, unlimited products and suppliers, 30-day free trial.

SteadyShelf is launching on the Shopify App Store. Join early access to get the install link first.

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