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Footwear development glossary
The vocabulary of building shoes and boots, in plain English. Lasts, tooling, costing, constructions, materials, samples, and inspections, defined the way developers use the words with factories, and why each one matters to your brand.
- AQL (acceptance quality limit)
- The sampling standard used in final inspection. An inspector pulls a set number of pairs based on the order size and counts defects; if they exceed the allowed number for the agreed AQL level, the lot fails. Brands set separate limits for critical, major, and minor defects, and those limits should be agreed in writing before production starts.
- Bill of materials (BOM)
- The complete list of every material and component in a shoe, with supplier, specification, color, and consumption per pair. It is the basis of the costing, so an incomplete BOM means an unreliable price.
- Cement construction
- A construction where the lasted upper is bonded to the sole with adhesive after the surfaces are cleaned, primed, and heat-activated. It is the most common construction in athletic, casual, and hiking footwear because it is light, flexible, and efficient, and it depends on a well-controlled bonding process.
- Collar
- The top edge of the shoe around the ankle opening, usually padded. Collar height, shape, and padding affect heel hold, comfort, and rubbing.
- Confirmation sample
- A production-ready sample made with production materials and processes and approved by the brand. It becomes the standard every production pair is inspected against, so it should be signed, sealed, and kept by both brand and factory.
- Cost engineering
- Hitting a target FOB price by changing how a shoe is specified and built, through pattern yield, component count, materials, construction, and shared tooling, while keeping what the customer values. It works best during development, before tooling is cut. See our guide on lowering FOB cost.
- Development calendar
- The schedule of milestones for a season or line, built backward from the date product must reach retail: brief, design, sample rounds, sales meetings, purchase orders, production, and shipping. A missed date early in the calendar usually costs a delivery window later. See the development timeline.
- Direct-attach construction (injection)
- A construction where the sole is formed by injecting PU, TPU, rubber, or PVC into a mold that closes around the lasted upper, bonding the sole without separate cementing. Common in work and safety boots for its durable bond, it requires injection machines and a mold for each size.
- Durometer (rubber compound)
- A measure of hardness for rubber and foam, read on scales such as Shore A for rubber and Asker C or Shore C for foams like EVA. The rubber compound and its durometer drive grip, abrasion resistance, and how a sole behaves in cold or wet conditions, so they belong in the spec.
- EVA
- Ethylene vinyl acetate, the lightweight foam used in most athletic and casual midsoles. It is either compression molded or injection molded, and it cushions well but loses some rebound over time as it compresses.
- Final inspection
- An inspection of finished, packed goods before shipment, usually by random sampling to an agreed AQL. It checks workmanship, measurements, labeling, and packing, and it is the last chance to stop a bad lot before it leaves the factory.
- Fit sample
- A sample built to check fit on real feet, first in the sample size and then across the size run. Fit samples confirm the last and the pattern before tooling and materials are committed.
- FOB (free on board)
- The standard price basis in footwear: the cost of a finished, packed pair loaded on the vessel at the port of origin. It includes materials, labor, overhead, factory margin, amortized tooling, and packaging, and excludes freight, duty, and everything after loading.
- Goodyear welt
- A construction where a strip of material called the welt is stitched to the upper and to a rib on the insole, and the outsole is then stitched to the welt. It is durable and resoleable, and it is heavier, stiffer, and more labor-intensive than cement construction.
- Grading
- Scaling the pattern and last from the sample size across every size in the run, using set increments of length and girth. Poor grading is why a shoe can fit well in the sample size and badly at the ends of the size run.
- Hand-laid rubber
- A rubber boot construction where pieces of uncured rubber are laid by hand over a lined last and then vulcanized in an autoclave into one piece. It is used in premium hunting, farm, and field boots and calls for factories with specialized skills.
- Heel counter
- A stiffener built into the back of the shoe that cups the heel. It holds the shape of the heel and keeps the foot stable, and a weak or poorly placed counter shows up as heel slip and early breakdown.
- Inline inspection
- Inspection during production at key stages such as cutting, stitching, lasting, and bottoming. It catches problems while they can still be corrected, before the whole order is built.
- Insole board
- The firm layer the upper is lasted to in board-lasted construction, made from cellulose, fiberboard, or similar materials. It forms the platform under the foot and is separate from the removable footbed.
- Lab testing
- Physical and chemical testing of materials and finished shoes: bond strength, flex, abrasion, colorfastness, slip resistance, waterproofness, and restricted substances. It verifies performance before production and supports compliance with retailer and legal requirements.
- Landed cost
- The full cost of a pair delivered to your warehouse: FOB plus freight, insurance, duties and tariffs, customs brokerage, and inland transport. Margins should be calculated on landed cost, because a lower FOB can still land higher.
- Last
- The three-dimensional form a shoe is built around. It sets fit, volume, toe shape, heel height, and toe spring, and production lasts are made in every size for both feet. The last is the single most important fit decision in a shoe.
- Liaison office
- A brand's own office in the producing country, staffed to manage development, factory communication, and quality on site. It gives a brand daily presence at its factories without relying entirely on an agent or the factory's own staff.
- Lug
- A raised traction element on an outsole. Lug depth, shape, and spacing determine grip on loose or muddy ground and how well the sole sheds debris.
- Midsole
- The layer between the outsole and the upper that provides cushioning, stability, and shock absorption. It is usually EVA, PU, or another foam, and it largely sets how a shoe feels underfoot.
- Mondopoint
- A sizing system based on foot length, and optionally width, measured in millimeters. It is used for ski boots and military footwear and is a useful common reference when converting between size systems.
- MOQ (minimum order quantity)
- The smallest order a factory or material supplier will accept, often set per style, per color, or per material. Orders below the MOQ usually carry a surcharge or won't be accepted, which is why too many colorways raise cost.
- Neoprene
- A synthetic rubber foam, usually laminated with fabric, that insulates and flexes. It is used in waders and in rubber and neoprene boots for hunting and fishing, where its thickness largely sets warmth.
- Open tooling
- Existing molds or lasts owned by a factory or supplier and available to any brand. It saves tooling investment and time, and the trade-off is that the sole or shape is not exclusive to you.
- Outsole
- The bottom layer of the shoe that contacts the ground, most often molded rubber. Its compound, tread pattern, and thickness determine traction, wear life, and much of the shoe's weight.
- Pattern
- The set of flat pieces that make up the upper, developed from the shape of the last. The pattern controls fit, how the pieces assemble, and how much material is wasted in cutting.
- PDM (product data management)
- Software that holds tech packs, BOMs, costings, and sample history in one place. A working PDM system keeps brand, agents, and factories building from the same version of the spec.
- Proto sample
- The first physical sample built from a design, usually in one size and often in substitute materials or colors. It checks the look, proportions, and construction before fit and material decisions are finalized.
- PU (polyurethane)
- A versatile material used for midsoles and direct-attach soles, footbeds, and coated synthetic uppers. PU foam is denser and more durable than EVA and also heavier.
- Quarter
- The rear section of the upper that wraps the sides and back of the foot behind the vamp. On many shoes the eyestay and lacing sit on the quarters.
- Salesman samples (SMS)
- Samples made in the sample size for sales reps, sell-in meetings, and marketing, built before production. They should represent production quality, because buyers order from them.
- Seam sealing
- Sealing stitched seams and needle holes with tape or liquid sealant so water can't enter. It is essential in waterproof footwear and is one of the first places a cost-cut causes leaks.
- Shank
- A stiffening piece placed under the arch between the insole and outsole, made of steel, fiberglass, nylon, or TPU. It supports the foot and controls twisting, which matters most in boots that carry load or climb.
- Size run
- The range of sizes a style is made in, and in an order, how many pairs are produced in each size. A size curve that doesn't match your customers leaves you short in some sizes and overstocked in others.
- Strobel construction
- A construction where the upper is stitched to a flexible fabric sock with a strobel machine, closing the bottom before the sole is attached. It is light and flexible and is standard in athletic footwear.
- Tech pack
- The technical specification package for a style: drawings, measurements, BOM, colors, construction details, logo placements, and packaging. The factory builds to it, so anything missing from the tech pack is left to the factory's judgment.
- Toe box (toe puff)
- The front of the shoe around the toes, and the stiffener built into it, called the toe puff or box toe, that holds its shape. Toe box volume affects comfort, and the stiffener keeps the toe from collapsing over time.
- Toe spring
- The upward curve of the toe off the ground, built into the bottom of the last. It helps the foot roll through each step, and too much or too little changes how the shoe walks and where it wears.
- Tooling
- The molds, cutting dies, and lasts needed to produce a shoe. Outsole and midsole molds are made for each size, which makes tooling one of the largest upfront commitments in footwear and a strong reason to share outsoles across styles.
- TPU (thermoplastic polyurethane)
- A tough, abrasion-resistant plastic used for heel counters, overlays, shanks, cleat plates, and some outsoles. It adds structure and durability at low weight.
- Upper
- Everything on a shoe above the sole: the vamp, quarters, collar, tongue, lining, and reinforcements. The upper sets the look, much of the fit, and most of the material cost.
- Vamp
- The front section of the upper covering the toes and instep, ahead of the quarters. It takes the most flexing in a step, so material choice and seam placement there matter.
- Vulcanized construction
- A construction where the rubber sole and foxing tape are applied to the upper and then cured with heat and pressure in an oven, bonding everything together. It is the classic method for canvas sneakers and skate shoes and gives a flexible, grippy sole.
- Waterproof membrane
- A thin, breathable layer, such as Gore-Tex or a factory's own membrane, built into the upper, usually as a bootie. It keeps water out while letting moisture vapor escape, and it only works if the construction and seam sealing are right.
- Wear test
- Putting samples on real users in real conditions for a set period and collecting structured feedback on fit, comfort, and durability. It finds the problems lab tests miss. See fit and wear testing.
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