Zetaliner and Zeta II Helmet Liner Selection

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Choosing a Helmet Liner Thickness

Both liners comes in four thicknesses: 1/4", 3/8", 1/2" and 5/8".
The most commonly used thickness is 3/8". To select the proper liner thickness, review the information below, then find your part number. NOTE: If your TPL®* has been heated and fitted, you will probably need a Helmet Liner one thickness thinner than those listed below.

For a ZetaLiner® or Zeta II™ Helmet Liner

IF YOUR TPL® LINER HAS:	THEN TRY:
2 Layers	1/4" ZetaLiner® Liner
3 Layers	3/8" ZetaLiner® Liner
4-5 Layers	1/2" ZetaLiner® Liner
5+ Layers	5/8" ZetaLiner® Liner

NOTE: The sizing informaton above is intended to suggest a starting point for the fitting process. Each pilot should be fitted individually for comfort and stability. Final results may differ from the above data. Fitting only takes minutes!

HELMET TYPE	HELMET SIZE	ZETALINER® Helmet Liner Length
Rotorcraft Helmets
SPH-4®*	Regular Large X-Large	15" 16" 16" - 17"
SPH-4B®*	Regular X-Large	15" 16" - 17"
SPH-5®*	Regular X-Large	15" 16" - 17"
HGU-84	Medium Large X-Large X-Large Wide	12"-13" 13"-14" 14"-15" 14"-15"
HELMET TYPE	HELMET SIZE	ZETA II™ Helmet Liner Length
HGU-56	XXS/XS S/M L XL	15" 16" 17" 18"

HELMET TYPE	HELMET SIZE	ZETALINER® Helmet Liner Lenght
Fixed Wing Helmets
HGU-33	Medium Large X-Large	12"-13" 13"-14" 14"-15"
HGU-55	Medium Large X-Large	12"-13" 13"-14" 14"-15"
HGU-68	Medium Large X-Large X-Large Wide	12"-13" 13"-14" 14"-15" 14"-15"
HGU-85	Medium Large X-Large X-Large Wide	12"-13" 13"-14" 14"-15" 14"-15"
CGF	Medium Large X-Large	12" 13" 14"
Alpha	Please call Xtreme ALSE for information.

Order Guide for ZetaLiner or Zeta II Helmet Liners

To Contact Xtreme ALSE:
         Phone: 931-552-2506/2503
        Fax:       931-552-1561
       Address: 1792 Alpine Dr. Clarksville, TN 37040
      Email:      sales@xtremealse.com