SHELL GRD™ builds impact protection as a mapped response system, not a single shell. FlexSpine™ is the Performance Technology assigned to the zone that moves the most — the knuckle line — and it solves a problem most impact-protection gloves never solve: staying continuous through the bend.

Impact protection has a geometry problem before it has a materials problem. The zone most exposed to blunt force — the back of the hand, across the knuckles and finger backs — is also the zone that flexes hardest during real work: closing a grip, flexing to trigger a tool, working knuckle-first into a tight clearance. Coverage that holds up when the hand is flat and open is not the same as coverage that holds up when the hand is doing its job.

What It Is

FlexSpine™ is one of five named SHELL GRD™ Performance Technologies on the Stego® platform for impact protection. Where a conventional impact panel is built as one continuous piece of TPR (thermoplastic rubber, the semi-rigid polymer SHELL GRD’s impact zones are built from), FlexSpine is built as a structure: the panel is segmented into a chain of smaller, linked plates positioned across the fingers, knuckles, and back of the hand. Stego states it directly: “Segmented TPR structure supports natural articulation & continuous impact coverage.” The segmentation is not a styling choice. It is the mechanism.

Why It’s Built That Way

SHELL GRD™ doesn’t engineer to a single test result — it assigns each threat a force profile (vertical, angular, torsional) and builds structure around how that force actually behaves on a moving hand. FlexSpine is the platform’s answer to the profile most impact gloves get wrong: articulation.

A single rigid or semi-rigid panel forces a choice at every knuckle. Either the panel resists the joint and restricts the hand, or it has to break — a hinge, a gap, a soft seam — to let the joint move. That break is exactly where coverage disappears, and it disappears at the one point on the hand most likely to take an impact: the knuckle itself, at the moment it’s flexed and exposed.

FlexSpine removes the choice. By segmenting the panel into independently-moving plates instead of one continuous piece, the structure has somewhere to go when the joint bends — each segment shifts, the next picks up, and coverage stays contiguous across the motion instead of resetting at it. Decomposition of risk applied at the joint level: the hazard isn’t “impact” in the abstract, it’s impact at a specific moment, in a specific position, on a hand that is already moving. FlexSpine is engineered for that moment specifically.

How You’ll Feel It On Shift

The difference shows up in the motions impact gloves are usually worst at. Close a full fist around a wrench or a valve handle, and a rigid-panel glove either won’t let the hand close completely or leaves the knuckle exposed right at the point of maximum bend. Work knuckle-first into a tight clearance, or flex the fingers repeatedly to run a power tool, and a one-piece shell either fights the motion all shift or gives out quietly at the seam. FlexSpine’s segmented structure moves with the hand instead of against it — the knuckle stays under coverage mid-flex, not just when the hand is at rest between tasks.

FlexSpine reduces the risk of a coverage gap opening at the knuckle mid-motion. It does not eliminate the risk of impact injury, and it does not replace task-appropriate hazard controls.

Where It Lives

FlexSpine™ is engineered into the SHELL GRD™ Shell Series, paired with the platform’s other named Performance Technologies (ShockShell™, ImpactFlow™, TaskCore™, TorqueGuard™) and Stego’s Essential Technologies suite depending on the SKU. Three Shell Series gloves carry the FlexSpine™ feature bullet on their current Article Data Sheet:

ST-9065 — Impact + Cut + Hi-Vis ST-9070 — Impact + Cut + Grip ST-9080 — Impact + Cut + Hi-Vis

Each SKU pairs FlexSpine with a different combination of platform and Essential technologies for its specific task profile — the Performance Technology is shared, the execution is task-specific.

Standards

SKU	Category	ANSI/ISEA 105 Cut	EN 388:2016+A1:2018	ANSI/ISEA 138 Impact	EN ISO 21420 Dexterity
ST-9065	Impact + Cut + Hi-Vis	A5	4X42EP	Level 2	5
ST-9070	Impact + Cut + Grip	A7	4X44FP	Level 2	5
ST-9080	Impact + Cut + Hi-Vis	A7	4X44FP	Level 2	5