Every sharpening produces a hollow. Most players don't know what hollow they're on — or why it matters. Here's what's actually happening under your blade.
03 // Hollow
Hollow is the concave groove ground into the bottom of your blade during sharpening. It's measured as the radius of the circle that would complete that arc — and it determines how deeply your edges bite into the ice.
Look at a blade from the front. The bottom isn't flat — it's a curved groove. The edges on either side of that groove are the two contact points that grip the ice. The deeper and narrower that groove, the more aggressive the bite. The shallower and wider, the more glide.
The hollow radius is expressed as a fraction of an inch. A 1/2" hollow means the groove was carved by a wheel with a 1/2-inch radius. Smaller fractions mean a deeper, sharper groove. Larger fractions mean a shallower, smoother groove.
Hollow controls the balance between grip and glide — the two fundamental forces that make skating possible. Every hollow is a trade-off between these opposing qualities.
When you push off or dig into a turn, your edges sink slightly into the ice. The deeper the hollow, the more they sink — and the more traction you generate. But deeper edges also create more drag. Your glide suffers, your crossovers feel heavier, and your top-end speed diminishes.
A shallower hollow gives your edges less bite but lets them skim more freely. Straight-line speed improves. Long stride efficiency goes up. But in tight turns, quick pivots, or hard stops, you may feel your feet sliding instead of locking in.
Deeper hollows create sharper, more pronounced edges that dig into the ice — critical for explosive stops, tight turns, and quick direction changes.
Shallower hollows reduce drag during glide phases, improving straight-line speed and long-distance stride efficiency — key for wingers and defensemen.
More hollow depth means edges engage sooner and harder in a turn — you get higher edge engagement angles without slipping during crossovers and pivots.
Hollow that's too deep for your body weight or skating style forces your legs to fight extra drag on every stride — which compounds over a full game.
"The right hollow isn't the deepest one. It's the one you understand and control."
Common hollows range from 3/8" (very aggressive) to 1" (very shallow). Each sits in a different spot on the grip-to-glide continuum, and each suits a different type of skater.
Most players know they get their skates sharpened. Almost none know that every sharpening resets their hollow — and that switching sharpeners is the same as switching hollows.
Most players are on the wrong hollow for their size, position, or playing style. EDGE evaluates your current setup and recommends a hollow based on your actual skating — not guesswork.
Request a Blade Assessment Start from Part 1There's no single correct hollow. The right one depends on your position, skating style, ice conditions, and body weight — and ideally, on feedback from someone who watches you skate.
| Player Type | Typical Hollow | Why |
|---|---|---|
| Young / lighter skater (under 100 lbs) | 3/8" – 1/2" | Less body weight means less natural edge pressure — deeper hollow compensates to maintain grip. |
| Competitive youth, average build | 1/2" – 5/8" | Balanced grip and glide for the demands of competitive play. Most versatile range for developing players. |
| Forward — agility focus | 1/2" – 5/8" | Tighter turns, quicker starts, stronger edge engagement in offensive-zone plays. |
| Defenseman — power & stability | 5/8" – 3/4" | More glide for gap control and gap closing; sufficient grip for battle situations along the boards. |
| Goalie | Varies widely | Goalies often use asymmetric hollows or specialty profiles — hollow selection is highly individual. |
| Heavier skater (over 180 lbs) | 5/8" – 3/4" | More body weight naturally creates more edge pressure — a shallower hollow prevents over-digging and reduces fatigue. |
| Soft / poorly maintained ice | 1/2" or shallower | Soft ice already provides extra grip — a deeper hollow can cause edges to catch and trip on ruts and divots. |
| Hard / freshly cut ice | 5/8" or deeper | Hard ice reduces natural edge engagement — a deeper hollow restores grip on surfaces that would otherwise feel slippery. |
Knowing your hollow is step one. Making sure you get that hollow — every single sharpening, from the same machine — is what actually changes how your skates perform.
Most players can't feel a one-size change in hollow. But they can absolutely feel two or three sharpenings in a row from different places or different setups. The inconsistency compounds. By the time your body has adapted to one hollow, it changes again.
Professional players travel with their equipment manager for exactly this reason. Their skates are sharpened on one machine, by one person, to one spec, before every game. That consistency is part of their performance — not an afterthought.
Hollow doesn't exist in isolation. It works with your blade profile and your sharpening frequency to create a complete performance picture.
If your skates feel different every time you step on the ice…
it might not be your legs. It might not be your technique.
It might be the groove under your blade — and no one ever told you.
EDGE brings structured blade management to competitive hockey players and programs. If you want your hollow tracked, your preferences documented, and your sharpening consistent — we should talk.