Glass Straight Fine Hair

Glass Straight Fine Hair (Type 1A)

Quick look

• Type code: Type 1A — Glass Straight Fine Hair.
• Texture & porosity: Round fibers average roughly 50-60 micrometers in diameter and sit low on the porosity scale, so strands behave like smooth wire.¹
• Risk factors: Heavy tension or aggressive thinning pulls these fibers out of the blade path and collapses the only weight anchoring the outline.²
• Tool pairing: Lock in the perimeter with a short micro-serrated bevel, then detail with polished convex blades and a 40-42 tooth blender strictly mid-shaft.²

Why it matters

Type 1A hair reflects every cut mark because the glassy cuticle offers almost no internal grip. Building the shape with supportive bevel work before switching to glide-friendly convex edges keeps the perimeter crisp while still allowing controlled movement where the interior can afford it.²

Technique map

• Set the outline in natural fall with a micro-serrated bevel and near-zero elevation so the strand cannot skate away from the edge.²
• Once dry, point-detail micro sections with a 5.0 in convex shear and feather-light tension to avoid carving gaps in low-density panels.²
• Float a 40-42 tooth blender through the mid-shaft only, leaving the last inch untouched so fullness stays pinned to the bottom line.²
• Finish with a nozzle-controlled blow-dry and a soft polishing pass to reseal the cuticle and preserve the mirror finish clients expect.²

Usage notes

1. Relax finger tension before closing the shear; resting the section in the blades keeps fine strands from ejecting during the cut.²
2. Frame the face with freehand micro panels in natural fall so sparse hairlines read denser and stay blunt.
3. Audit each weight-removal pass—low-density hair only tolerates surface texturizing above the parietal ridge before the outline shows daylight.³

Maintenance / Client Care

• Schedule six to eight week perimeter dustings so the blunt line never frays.²
• Coach clients to mist volumizer at the scalp, then comb through mid-lengths to prevent product overload on the surface.²
• Direct airflow from root to tip with a concentrator a half-inch off the brush; this keeps the cuticle flat and the finish glassy.²

Related Types & Sources

Related hair types: Straight Hair with Swing (Type 1B), Dense Straight Heavy Hair (Type 1C)

Sources

1. High-throughput phenotyping methods for quantifying hair fiber morphology
2. How to Cut & Style Fine Hair
3. Weight Removal 101