Most restaking protocols want native ETH or their own LST. Kelp accepts stETH, ETHx and ETH directly, issuing rsETH against any of them. For a holder already in a liquid staking position, that removes an unwind-and-redeposit cycle with its gas costs and price risk.
The layering problem
Restaking stETH means your ETH is staked through Lido, wrapped through Kelp, and pledged to restaking services. Three contract systems, three governance processes, three ways to fail — and correlated in the sense that a problem at Lido propagates through everything above it. That is not an argument against using it, but it is the risk you are accepting and it is rarely stated plainly.
Liquidity and mechanics
rsETH has reasonable secondary depth for a second-tier LRT, is accepted in several lending markets, and has a functioning withdrawal path. The protocol takes roughly 10% of rewards.
Disclosure
Operator selection and secured services are documented, though less thoroughly than ether.fi's. Multiple audits are published with no incidents on record since launch.
Who should use it
Holders of stETH or ETHx who want restaking exposure without unwinding, and who understand the layered risk. Users starting from ETH should consider restaking natively through ether.fi or Puffer instead, which removes one layer.