Forcefield Pro Sub 4 Back Protector

Forcefield Pro Sub 4 Back Protector — The Insert Upgrade

The Pro Sub 4 is Forcefield's flagship jacket back protector insert. It targets the most common scenario in motorcycle safety: a rider with a good jacket but a mediocre or missing back protector.

Materials & Vegan Verification

Forcefield Nirvana foam: a viscoelastic polyurethane elastomer developed in-house. Verified vegan. No leather backing, no animal-derived foam compounds, no wool liner. All construction is synthetic polymer.

Protection

• CE Level 2 (EN 1621-2:2014) — back protectors
• Level 2 transmits below 9 kN mean force (vs Level 1's 18 kN limit) — 50% less impact force transmitted to the spine
• Nirvana foam is flexible at body temperature, locks under sudden load
• Profile cut to spine curvature for contact across all vertebral zones
• Available in four sizes (S to XL) for wide jacket pocket compatibility

EN 1621-2 Level 2 vs Level 1 — The Numbers

Level	Max Transmitted Force
Level 1	< 18 kN
Level 2	< 9 kN

The Level 2 advantage is not marginal. The Pro Sub 4 is the answer to "is my back protector good enough?"

Fitting

The Pro Sub 4 fits most motorcycle jacket back protector pockets. Check your jacket's pocket dimensions (most Pro Sub 4 sizes list exact measurements). Forcefield includes a sizing guide. Trim marks on the foam edge allow minor size adjustments for tight pockets.

Verdict

The most impactful €60–75 you can spend on your riding safety. If your jacket shipped with a foam back pad, swap it for a Pro Sub 4 Level 2. The spine has no surgical workaround.

Verify current EN 1621-2:2014 Level 2 certification at point of purchase.