What this is
Every on-chain action — buying, redeeming, claiming — pays network gas. On Ethereum mainnet that can be a few dollars per transaction; on L2s like Arbitrum it is cents. Gas is priced per operation, not per dollar moved, which makes it a regressive cost.
What it means for your yield
For small positions, a round trip on mainnet can eat a meaningful slice of a year of yield: $20 of gas on a $1,000 position is 2% — half a year of a 4% APY gone before any market risk is taken. The same $20 on $100K is noise.
Where it appears on Pennyworth
The exit box quotes an indicative per-transaction gas figure for the product’s chain at recent prices, so the toll can be weighed against position size before entering.