---
title: "Tighten"
url: "https://help.maxon.net/c4d/en-us/Content/html/MHAIRMATERIAL-HAIRMATERIAL_GROUP_TIGHTEN.html"
section_path: "Simulate Menu > The Simulation System > Hair > Hair material > Hair Material > Tighten"
element_id: "MHAIRMATERIAL"
group_id: "HAIRMATERIAL_GROUP_TIGHTEN"
description: "This Hair channel analyzes all existing waves and curves and amplifies them (negative Tighten values will relax the hair). Hair that is completely …"
---

## Tighten

![Image: 005236.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005236.jpg)\
The **Tighten** channel will amplify existing waves and curves, and straight hair will curl.

This Hair channel analyzes all existing waves and curves and amplifies them (negative **Tighten** values will **relax** the hair). Hair that is completely straight will be curled in the direction of the root.

### Tighten

Parameter ID: `HAIRMATERIAL_TIGHTEN` · Range: [-100..100%]

Use this setting to adjust the strength of the curl. Don't forget that negative values will **relax** the hair!

### Variation

Parameter ID: `HAIRMATERIAL_TIGHTEN_VAR` · Range: [0..100%]

Use this setting to randomly vary the strength of the curls within this channel.

### Amount

Parameter ID: `HAIRMATERIAL_TIGHTEN_AMOUNT` · Range: [0..100%]

Use this setting to define the percentage of hairs whose tightness should be affected.

### Curve

Parameter ID: `HAIRMATERIAL_TIGHTEN_CURVE`

![Image: 005237.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005237.jpg)\
In the example above, **Tighten** was adjusted to make each hair curl in the center.

Use this curve to define the tightness along the length of the hair.

### Texture

Parameter ID: `HAIRMATERIAL_TIGHTEN_SHADER`

A texture loaded into this field will affect the tighten strength across an entire area.