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This is replacement foam for the lumbar pad of the K4 Frame. The Standard foam is what is shipped with all K4 Frames by default. You can replace the Standard foam if, after years of heavy and hard use, you want to have a fresh lumbar pad. The Soft foam option is for users who find the Standard foam to be too firm, even after the initial break-in period.
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We currently ship within the US, with more countries coming soon.
Final cost and dates are confirmed at checkout.
🇺🇸 Ship from USA · On Agora since 2026
$14.99