From the IIHF site:
Here’s how they did it:
A shift to single-layer laser-perforated numbers (instead of layering up heavy twill) that they applied by heat (rather than stitching them down), both of which increased breathability and articulation.
Doing away with the previous large, heavy centre-front crest in favour of a small, intricate, badge (select teams were moved to a new configuration led by country name rather than their crest), which reduced weight, resulting in better articulation for the athlete.
Consolidating fonts across kits. (Though select teams got a unique font.)
Further, the idea of alchemy involves transforming base metals into gold. “It’s all about creating an extremely valuable and desired outcome,” says Toudjine-Williams. This element of the theme comes to life with the following films and flicker capabilities employed throughout the jersey:
Amplification of each team’s colours through a cascading gradient.
An expanded colour palette that includes secondary and tertiary colours.
A new blade Swoosh (inspired by a hockey skate blade) with chrome flicker that sparkles under the arena lights.
The flicker film (rather than heavy twill) addition to the top of the base for the crest and numbers increases vibrancy.
Injected silicon molds make the trims pop.