We've spent time on how tube sets are rated: a printed LBS/KG number tested at a defined stretch length. Loop bands — the continuous, flat mini bands sold without handles — are graded differently, and it's worth understanding why.
Two rating systems, one product category. Walk through a resistance band lineup and you'll typically see tube sets labeled with a specific number (10 LBS, 30 LBS) and loop band sets labeled with a tier name instead (Light, Medium, Heavy, X-Heavy). Both are legitimate rating conventions — they've just developed around two different physical formats.
The tier label system. Loop bands are most commonly sold in four or five tiers, from Light up through Extra-Heavy or X-Heavy. Unlike a tube's printed force value, a tier name doesn't claim a specific tested number — it's a relative ranking within that manufacturer's own lineup, similar to how a shoe might be labeled "wide" rather than given an exact millimeter measurement.
The dot-count convention. Many brands reinforce the text label with a printed dot count — one dot for the lightest tier, up through five for the heaviest — set directly on the band alongside the tier name. It's a redundant marking by design: if the fabric or print wears and the text becomes hard to read, the dot count still communicates the tier at a glance.
What actually sets the tier. Underneath the label, the tier is a function of the loop's cross-section — its width and its material thickness. A wider, thicker loop requires more force to stretch and gets ranked in a higher tier; a narrower, thinner loop sits lower. This is the same underlying principle covered in our tube-ladder piece — resistance tracks material cross-section — just applied to a flat continuous band instead of a round tube with a hollow core.
Why there's no printed force number. Tube ratings are tested and printed because tubes are sold as part of a modular system with attachable hardware, which creates a practical reason to standardize a number across a lineup. Loop bands, as a simpler continuous-loop product, are more commonly graded through each manufacturer's own internal tier testing rather than a shared, printed force-at-stretch figure — which is part of why tier names aren't always perfectly consistent from one brand's "Heavy" to another's.
The takeaway. A loop band's tier and a tube's LBS rating are answering the same underlying question — how much force does this take to stretch — through two different labeling conventions shaped by two different manufacturing formats. Recognizing which system you're looking at is useful context for comparing bands within a set, or across brands.